Reliable Transmission of Multicast and Broadcast Services

ABSTRACT

A wireless device receives parameters comprising a radio network temporary identifier (RNTI) associated with a multicast and broadcast service (MBS) session; a first scrambling identity associated with the MBS session; and a second scrambling identity associated with unicast transmissions. The wireless device receives, based on the RNTI, a group common downlink control information (DCI) scheduling a transport block (TB) of the MBS session. Based on the group common DCI being received based on the RNTI, the wireless device determines a scrambling identity for the TB being equal to the first scrambling identity, and receives the TB being scrambled with a scrambling sequence initialized by the determined scrambling identity and the RNTI.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of International Application No. PCT/US2021/055949, filed Oct. 21, 2021, which claims the benefit of U.S. Provisional Application No. 63/094,854, filed Oct. 21, 2020, both of which are hereby incorporated by reference their entireties.

BRIEF DESCRIPTION OF THE DRAWINGS

Examples of several of the various embodiments of the present disclosure are described herein with reference to the drawings.

FIG. 1A and FIG. 1B illustrate example mobile communication networks in which embodiments of the present disclosure may be implemented.

FIG. 2A and FIG. 2B respectively illustrate a New Radio (NR) user plane and control plane protocol stack.

FIG. 3 illustrates an example of services provided between protocol layers of the NR user plane protocol stack of FIG. 2A.

FIG. 4A illustrates an example downlink data flow through the NR user plane protocol stack of FIG. 2A.

FIG. 4B illustrates an example format of a MAC subheader in a MAC PDU.

FIG. 5A and FIG. 5B respectively illustrate a mapping between logical channels, transport channels, and physical channels for the downlink and uplink.

FIG. 6 is an example diagram showing RRC state transitions of a UE.

FIG. 7 illustrates an example configuration of an NR frame into which OFDM symbols are grouped.

FIG. 8 illustrates an example configuration of a slot in the time and frequency domain for an NR carrier.

FIG. 9 illustrates an example of bandwidth adaptation using three configured BWPs for an NR carrier.

FIG. 10A illustrates three carrier aggregation configurations with two component carriers.

FIG. 10B illustrates an example of how aggregated cells may be configured into one or more PUCCH groups.

FIG. 11A illustrates an example of an SS/PBCH block structure and location.

FIG. 11B illustrates an example of CSI-RSs that are mapped in the time and frequency domains.

FIG. 12A and FIG. 12B respectively illustrate examples of three downlink and uplink beam management procedures.

FIG. 13A, FIG. 13B, and FIG. 13C respectively illustrate a four-step contention-based random access procedure, a two-step contention-free random access procedure, and another two-step random access procedure.

FIG. 14A illustrates an example of CORESET configurations for a bandwidth part.

FIG. 14B illustrates an example of a CCE-to-REG mapping for DCI transmission on a CORESET and PDCCH processing.

FIG. 15 illustrates an example of a wireless device in communication with a base station.

FIG. 16A, FIG. 16B, FIG. 16C, and FIG. 16D illustrate example structures for uplink and downlink transmission.

FIG. 17A, FIG. 17B and FIG. 17C illustrate examples of MAC subheaders, according to some embodiments.

FIG. 18A illustrates an example of a DL MAC PDU, according to some embodiments.

FIG. 18B illustrates an example of an UL MAC PDU, according to some embodiments.

FIG. 19 illustrates example LCIDs for downlink, according to some embodiments.

FIG. 20 illustrates example LCIDs for uplink, according to some embodiments.

FIG. 21A and FIG. 21B illustrate examples of SCell activation/deactivation MAC CE formats, according to some embodiments.

FIG. 22 illustrates an example of BWP activation/deactivation on a SCell, according to some embodiments.

FIG. 23A, FIG. 23B and FIG. 23C illustrate examples of configuration parameters of a MIB, according to some embodiments.

FIG. 24 illustrates an example of RRC configuration of a SIB1 message, according to some embodiments.

FIG. 25 illustrates an example of RRC configuration of a downlink BWP, according to some embodiments.

FIG. 26 illustrates an example of RRC configuration of a search space, according to some embodiments.

FIG. 27A and FIG. 27B illustrate examples of unicast, broadcast and multicast transmission, according to some embodiments.

FIG. 28A and FIG. 28B illustrate examples of MBS resource allocations, according to some embodiments.

FIG. 29 illustrates an example of HARQ process management in a HARQ entity, according to some embodiments.

FIG. 30 illustrates an example of HARQ retransmission, according to some embodiments.

FIG. 31A and FIG. 31B illustrate examples of multicast retransmission of an MBS TB and unicast retransmission of an MBS TB, according to some embodiments.

FIG. 32 is a flowchart illustrating an example of HARQ retransmission of an MBS TB, according to some embodiments.

FIG. 33 illustrates an example of HARQ process management, according to some embodiments.

FIG. 34 illustrates an example of HARQ retransmission of an MBS TB, according to some embodiments.

FIG. 35 is a flowchart illustrating an example of HARQ retransmission of an MBS TB, according to some embodiments.

FIG. 36 is a flowchart illustrating an example of HARQ retransmission of an MBS TB, according to some embodiments.

DETAILED DESCRIPTION

In the present disclosure, various embodiments are presented as examples of how the disclosed techniques may be implemented and/or how the disclosed techniques may be practiced in environments and scenarios. It will be apparent to persons skilled in the relevant art that various changes in form and detail can be made therein without departing from the scope. In fact, after reading the description, it will be apparent to one skilled in the relevant art how to implement alternative embodiments. The present embodiments should not be limited by any of the described exemplary embodiments. The embodiments of the present disclosure will be described with reference to the accompanying drawings. Limitations, features, and/or elements from the disclosed example embodiments may be combined to create further embodiments within the scope of the disclosure. Any figures which highlight the functionality and advantages, are presented for example purposes only. The disclosed architecture is sufficiently flexible and configurable, such that it may be utilized in ways other than that shown. For example, the actions listed in any flowchart may be re-ordered or only optionally used in some embodiments.

Embodiments may be configured to operate as needed. The disclosed mechanism may be performed when certain criteria are met, for example, in a wireless device, a base station, a radio environment, a network, a combination of the above, and/or the like. Example criteria may be based, at least in part, on for example, wireless device or network node configurations, traffic load, initial system set up, packet sizes, traffic characteristics, a combination of the above, and/or the like. When the one or more criteria are met, various example embodiments may be applied. Therefore, it may be possible to implement example embodiments that selectively implement disclosed protocols.

A base station may communicate with a mix of wireless devices. Wireless devices and/or base stations may support multiple technologies, and/or multiple releases of the same technology. Wireless devices may have some specific capability(ies) depending on wireless device category and/or capability(ies). When this disclosure refers to a base station communicating with a plurality of wireless devices, this disclosure may refer to a subset of the total wireless devices in a coverage area. This disclosure may refer to, for example, a plurality of wireless devices of a given LTE or 5G release with a given capability and in a given sector of the base station. The plurality of wireless devices in this disclosure may refer to a selected plurality of wireless devices, and/or a subset of total wireless devices in a coverage area which perform according to disclosed methods, and/or the like. There may be a plurality of base stations or a plurality of wireless devices in a coverage area that may not comply with the disclosed methods, for example, those wireless devices or base stations may perform based on older releases of LTE or 5G technology.

In this disclosure, “a” and “an” and similar phrases are to be interpreted as “at least one” and “one or more.” Similarly, any term that ends with the suffix “(s)” is to be interpreted as “at least one” and “one or more.” In this disclosure, the term “may” is to be interpreted as “may, for example.” In other words, the term “may” is indicative that the phrase following the term “may” is an example of one of a multitude of suitable possibilities that may, or may not, be employed by one or more of the various embodiments. The terms “comprises” and “consists of”, as used herein, enumerate one or more components of the element being described. The term “comprises” is interchangeable with “includes” and does not exclude unenumerated components from being included in the element being described. By contrast, “consists of” provides a complete enumeration of the one or more components of the element being described. The term “based on”, as used herein, should be interpreted as “based at least in part on” rather than, for example, “based solely on”. The term “and/or” as used herein represents any possible combination of enumerated elements. For example, “A, B, and/or C” may represent A; B; C; A and B; A and C; B and C; or A, B, and C.

If A and B are sets and every element of A is an element of B, A is called a subset of B. In this specification, only non-empty sets and subsets are considered. For example, possible subsets of B={cell1, cell2} are: {cell1}, {cell2}, and {cell1, cell2}. The phrase “based on” (or equally “based at least on”) is indicative that the phrase following the term “based on” is an example of one of a multitude of suitable possibilities that may, or may not, be employed to one or more of the various embodiments. The phrase “in response to” (or equally “in response at least to”) is indicative that the phrase following the phrase “in response to” is an example of one of a multitude of suitable possibilities that may, or may not, be employed to one or more of the various embodiments. The phrase “depending on” (or equally “depending at least to”) is indicative that the phrase following the phrase “depending on” is an example of one of a multitude of suitable possibilities that may, or may not, be employed to one or more of the various embodiments. The phrase “employing/using” (or equally “employing/using at least”) is indicative that the phrase following the phrase “employing/using” is an example of one of a multitude of suitable possibilities that may, or may not, be employed to one or more of the various embodiments.

The term configured may relate to the capacity of a device whether the device is in an operational or non-operational state. Configured may refer to specific settings in a device that effect the operational characteristics of the device whether the device is in an operational or non-operational state. In other words, the hardware, software, firmware, registers, memory values, and/or the like may be “configured” within a device, whether the device is in an operational or nonoperational state, to provide the device with specific characteristics. Terms such as “a control message to cause in a device” may mean that a control message has parameters that may be used to configure specific characteristics or may be used to implement certain actions in the device, whether the device is in an operational or non-operational state.

In this disclosure, parameters (or equally called, fields, or Information elements: IEs) may comprise one or more information objects, and an information object may comprise one or more other objects. For example, if parameter (IE) N comprises parameter (IE) M, and parameter (IE) M comprises parameter (IE) K, and parameter (IE) K comprises parameter (information element) J. Then, for example, N comprises K, and N comprises J. In an example embodiment, when one or more messages comprise a plurality of parameters, it implies that a parameter in the plurality of parameters is in at least one of the one or more messages, but does not have to be in each of the one or more messages.

Many features presented are described as being optional through the use of “may” or the use of parentheses. For the sake of brevity and legibility, the present disclosure does not explicitly recite each and every permutation that may be obtained by choosing from the set of optional features. The present disclosure is to be interpreted as explicitly disclosing all such permutations. For example, a system described as having three optional features may be embodied in seven ways, namely with just one of the three possible features, with any two of the three possible features or with three of the three possible features.

Many of the elements described in the disclosed embodiments may be implemented as modules. A module is defined here as an element that performs a defined function and has a defined interface to other elements. The modules described in this disclosure may be implemented in hardware, software in combination with hardware, firmware, wetware (e.g. hardware with a biological element) or a combination thereof, which may be behaviorally equivalent. For example, modules may be implemented as a software routine written in a computer language configured to be executed by a hardware machine (such as C, C++, Fortran, Java, Basic, Matlab or the like) or a modeling/simulation program such as Simulink, Stateflow, GNU Octave, or LabVIEWMathScript. It may be possible to implement modules using physical hardware that incorporates discrete or programmable analog, digital and/or quantum hardware. Examples of programmable hardware comprise: computers, microcontrollers, microprocessors, application-specific integrated circuits (ASICs); field programmable gate arrays (FPGAs); and complex programmable logic devices (CPLDs). Computers, microcontrollers and microprocessors are programmed using languages such as assembly, C, C++ or the like. FPGAs, ASICs and CPLDs are often programmed using hardware description languages (HDL) such as VHSIC hardware description language (VHDL) or Verilog that configure connections between internal hardware modules with lesser functionality on a programmable device. The mentioned technologies are often used in combination to achieve the result of a functional module.

FIG. 1A illustrates an example of a mobile communication network 100 in which embodiments of the present disclosure may be implemented. The mobile communication network 100 may be, for example, a public land mobile network (PLMN) run by a network operator. As illustrated in FIG. 1A, the mobile communication network 100 includes a core network (CN) 102, a radio access network (RAN) 104, and a wireless device 106.

The CN 102 may provide the wireless device 106 with an interface to one or more data networks (DNs), such as public DNs (e.g., the Internet), private DNs, and/or intra-operator DNs. As part of the interface functionality, the CN 102 may set up end-to-end connections between the wireless device 106 and the one or more DNs, authenticate the wireless device 106, and provide charging functionality.

The RAN 104 may connect the CN 102 to the wireless device 106 through radio communications over an air interface. As part of the radio communications, the RAN 104 may provide scheduling, radio resource management, and retransmission protocols. The communication direction from the RAN 104 to the wireless device 106 over the air interface is known as the downlink and the communication direction from the wireless device 106 to the RAN 104 over the air interface is known as the uplink. Downlink transmissions may be separated from uplink transmissions using frequency division duplexing (FDD), time-division duplexing (TDD), and/or some combination of the two duplexing techniques.

The term wireless device may be used throughout this disclosure to refer to and encompass any mobile device or fixed (non-mobile) device for which wireless communication is needed or usable. For example, a wireless device may be a telephone, smart phone, tablet, computer, laptop, sensor, meter, wearable device, Internet of Things (IoT) device, vehicle road side unit (RSU), relay node, automobile, and/or any combination thereof. The term wireless device encompasses other terminology, including user equipment (UE), user terminal (UT), access terminal (AT), mobile station, handset, wireless transmit and receive unit (WTRU), and/or wireless communication device.

The RAN 104 may include one or more base stations (not shown). The term base station may be used throughout this disclosure to refer to and encompass a Node B (associated with UMTS and/or 3G standards), an Evolved Node B (eNB, associated with E-UTRA and/or 4G standards), a remote radio head (RRH), a baseband processing unit coupled to one or more RRHs, a repeater node or relay node used to extend the coverage area of a donor node, a Next Generation Evolved Node B (ng-eNB), a Generation Node B (gNB, associated with NR and/or 5G standards), an access point (AP, associated with, for example, WiFi or any other suitable wireless communication standard), and/or any combination thereof. A base station may comprise at least one gNB Central Unit (gNB-CU) and at least one a gNB Distributed Unit (gNB-DU).

A base station included in the RAN 104 may include one or more sets of antennas for communicating with the wireless device 106 over the air interface. For example, one or more of the base stations may include three sets of antennas to respectively control three cells (or sectors). The size of a cell may be determined by a range at which a receiver (e.g., a base station receiver) can successfully receive the transmissions from a transmitter (e.g., a wireless device transmitter) operating in the cell. Together, the cells of the base stations may provide radio coverage to the wireless device 106 over a wide geographic area to support wireless device mobility.

In addition to three-sector sites, other implementations of base stations are possible. For example, one or more of the base stations in the RAN 104 may be implemented as a sectored site with more or less than three sectors. One or more of the base stations in the RAN 104 may be implemented as an access point, as a baseband processing unit coupled to several remote radio heads (RRHs), and/or as a repeater or relay node used to extend the coverage area of a donor node. A baseband processing unit coupled to RRHs may be part of a centralized or cloud RAN architecture, where the baseband processing unit may be either centralized in a pool of baseband processing units or virtualized. A repeater node may amplify and rebroadcast a radio signal received from a donor node. A relay node may perform the same/similar functions as a repeater node but may decode the radio signal received from the donor node to remove noise before amplifying and rebroadcasting the radio signal.

The RAN 104 may be deployed as a homogenous network of macrocell base stations that have similar antenna patterns and similar high-level transmit powers. The RAN 104 may be deployed as a heterogeneous network. In heterogeneous networks, small cell base stations may be used to provide small coverage areas, for example, coverage areas that overlap with the comparatively larger coverage areas provided by macrocell base stations. The small coverage areas may be provided in areas with high data traffic (or so-called “hotspots”) or in areas with weak macrocell coverage. Examples of small cell base stations include, in order of decreasing coverage area, microcell base stations, picocell base stations, and femtocell base stations or home base stations.

The Third-Generation Partnership Project (3GPP) was formed in 1998 to provide global standardization of specifications for mobile communication networks similar to the mobile communication network 100 in FIG. 1A. To date, 3GPP has produced specifications for three generations of mobile networks: a third generation (3G) network known as Universal Mobile Telecommunications System (UMTS), a fourth generation (4G) network known as Long-Term Evolution (LTE), and a fifth generation (5G) network known as 5G System (5GS). Embodiments of the present disclosure are described with reference to the RAN of a 3GPP 5G network, referred to as next-generation RAN (NG-RAN). Embodiments may be applicable to RANs of other mobile communication networks, such as the RAN 104 in FIG. 1A, the RANs of earlier 3G and 4G networks, and those of future networks yet to be specified (e.g., a 3GPP 6G network). NG-RAN implements 5G radio access technology known as New Radio (NR) and may be provisioned to implement 4G radio access technology or other radio access technologies, including non-3GPP radio access technologies.

FIG. 1B illustrates another example mobile communication network 150 in which embodiments of the present disclosure may be implemented. Mobile communication network 150 may be, for example, a PLMN run by a network operator. As illustrated in FIG. 1B, mobile communication network 150 includes a 5G core network (5G-CN) 152, an NG-RAN 154, and UEs 156A and 156B (collectively UEs 156). These components may be implemented and operate in the same or similar manner as corresponding components described with respect to FIG. 1A.

The 5G-CN 152 provides the UEs 156 with an interface to one or more DNs, such as public DNs (e.g., the Internet), private DNs, and/or intra-operator DNs. As part of the interface functionality, the 5G-CN 152 may set up end-to-end connections between the UEs 156 and the one or more DNs, authenticate the UEs 156, and provide charging functionality. Compared to the CN of a 3GPP 4G network, the basis of the 5G-CN 152 may be a service-based architecture. This means that the architecture of the nodes making up the 5G-CN 152 may be defined as network functions that offer services via interfaces to other network functions. The network functions of the 5G-CN 152 may be implemented in several ways, including as network elements on dedicated or shared hardware, as software instances running on dedicated or shared hardware, or as virtualized functions instantiated on a platform (e.g., a cloud-based platform).

As illustrated in FIG. 1B, the 5G-CN 152 includes an Access and Mobility Management Function (AMF) 158A and a User Plane Function (UPF) 158B, which are shown as one component AMF/UPF 158 in FIG. 1B for ease of illustration. The UPF 158B may serve as a gateway between the NG-RAN 154 and the one or more DNs. The UPF 158B may perform functions such as packet routing and forwarding, packet inspection and user plane policy rule enforcement, traffic usage reporting, uplink classification to support routing of traffic flows to the one or more DNs, quality of service (QoS) handling for the user plane (e.g., packet filtering, gating, uplink/downlink rate enforcement, and uplink traffic verification), downlink packet buffering, and downlink data notification triggering. The UPF 158B may serve as an anchor point for intra-/inter-Radio Access Technology (RAT) mobility, an external protocol (or packet) data unit (PDU) session point of interconnect to the one or more DNs, and/or a branching point to support a multi-homed PDU session. The UEs 156 may be configured to receive services through a PDU session, which is a logical connection between a UE and a DN.

The AMF 158A may perform functions such as Non-Access Stratum (NAS) signaling termination, NAS signaling security, Access Stratum (AS) security control, inter-CN node signaling for mobility between 3GPP access networks, idle mode UE reachability (e.g., control and execution of paging retransmission), registration area management, intra-system and inter-system mobility support, access authentication, access authorization including checking of roaming rights, mobility management control (subscription and policies), network slicing support, and/or session management function (SMF) selection. NAS may refer to the functionality operating between a CN and a UE, and AS may refer to the functionality operating between the UE and a RAN.

The 5G-CN 152 may include one or more additional network functions that are not shown in FIG. 1B for the sake of clarity. For example, the 5G-CN 152 may include one or more of a Session Management Function (SMF), an NR Repository Function (NRF), a Policy Control Function (PCF), a Network Exposure Function (NEF), a Unified Data Management (UDM), an Application Function (AF), and/or an Authentication Server Function (AUSF).

The NG-RAN 154 may connect the 5G-CN 152 to the UEs 156 through radio communications over the air interface. The NG-RAN 154 may include one or more gNBs, illustrated as gNB 160A and gNB 160B (collectively gNBs 160) and/or one or more ng-eNBs, illustrated as ng-eNB 162A and ng-eNB 162B (collectively ng-eNBs 162). The gNBs 160 and ng-eNBs 162 may be more generically referred to as base stations. The gNBs 160 and ng-eNBs 162 may include one or more sets of antennas for communicating with the UEs 156 over an air interface. For example, one or more of the gNBs 160 and/or one or more of the ng-eNBs 162 may include three sets of antennas to respectively control three cells (or sectors). Together, the cells of the gNBs 160 and the ng-eNBs 162 may provide radio coverage to the UEs 156 over a wide geographic area to support UE mobility.

As shown in FIG. 1B, the gNBs 160 and/or the ng-eNBs 162 may be connected to the 5G-CN 152 by means of an NG interface and to other base stations by an Xn interface. The NG and Xn interfaces may be established using direct physical connections and/or indirect connections over an underlying transport network, such as an internet protocol (IP) transport network. The gNBs 160 and/or the ng-eNBs 162 may be connected to the UEs 156 by means of a Uu interface. For example, as illustrated in FIG. 1B, gNB 160A may be connected to the UE 156A by means of a Uu interface. The NG, Xn, and Uu interfaces are associated with a protocol stack. The protocol stacks associated with the interfaces may be used by the network elements in FIG. 1B to exchange data and signaling messages and may include two planes: a user plane and a control plane. The user plane may handle data of interest to a user. The control plane may handle signaling messages of interest to the network elements.

The gNBs 160 and/or the ng-eNBs 162 may be connected to one or more AMF/UPF functions of the 5G-CN 152, such as the AMF/UPF 158, by means of one or more NG interfaces. For example, the gNB 160A may be connected to the UPF 158B of the AMF/UPF 158 by means of an NG-User plane (NG-U) interface. The NG-U interface may provide delivery (e.g., non-guaranteed delivery) of user plane PDUs between the gNB 160A and the UPF 158B. The gNB 160A may be connected to the AMF 158A by means of an NG-Control plane (NG-C) interface. The NG-C interface may provide, for example, NG interface management, UE context management, UE mobility management, transport of NAS messages, paging, PDU session management, and configuration transfer and/or warning message transmission.

The gNBs 160 may provide NR user plane and control plane protocol terminations towards the UEs 156 over the Uu interface. For example, the gNB 160A may provide NR user plane and control plane protocol terminations toward the UE 156A over a Uu interface associated with a first protocol stack. The ng-eNBs 162 may provide Evolved UMTS Terrestrial Radio Access (E-UTRA) user plane and control plane protocol terminations towards the UEs 156 over a Uu interface, where E-UTRA refers to the 3GPP 4G radio-access technology. For example, the ng-eNB 162B may provide E-UTRA user plane and control plane protocol terminations towards the UE 156B over a Uu interface associated with a second protocol stack.

The 5G-CN 152 was described as being configured to handle NR and 4G radio accesses. It will be appreciated by one of ordinary skill in the art that it may be possible for NR to connect to a 4G core network in a mode known as “non-standalone operation.” In non-standalone operation, a 4G core network is used to provide (or at least support) control-plane functionality (e.g., initial access, mobility, and paging). Although only one AMF/UPF 158 is shown in FIG. 1B, one gNB or ng-eNB may be connected to multiple AMF/UPF nodes to provide redundancy and/or to load share across the multiple AMF/UPF nodes.

As discussed, an interface (e.g., Uu, Xn, and NG interfaces) between the network elements in FIG. 1B may be associated with a protocol stack that the network elements use to exchange data and signaling messages. A protocol stack may include two planes: a user plane and a control plane. The user plane may handle data of interest to a user, and the control plane may handle signaling messages of interest to the network elements.

FIG. 2A and FIG. 2B respectively illustrate examples of NR user plane and NR control plane protocol stacks for the Uu interface that lies between a UE 210 and a gNB 220. The protocol stacks illustrated in FIG. 2A and FIG. 2B may be the same or similar to those used for the Uu interface between, for example, the UE 156A and the gNB 160A shown in FIG. 1B.

FIG. 2A illustrates a NR user plane protocol stack comprising five layers implemented in the UE 210 and the gNB 220. At the bottom of the protocol stack, physical layers (PHYs) 211 and 221 may provide transport services to the higher layers of the protocol stack and may correspond to layer 1 of the Open Systems Interconnection (OSI) model. The next four protocols above PHYs 211 and 221 comprise media access control layers (MACs) 212 and 222, radio link control layers (RLCs) 213 and 223, packet data convergence protocol layers (PDCPs) 214 and 224, and service data application protocol layers (SDAPs) 215 and 225. Together, these four protocols may make up layer 2, or the data link layer, of the OSI model.

FIG. 3 illustrates an example of services provided between protocol layers of the NR user plane protocol stack. Starting from the top of FIG. 2A and FIG. 3 , the SDAPs 215 and 225 may perform QoS flow handling. The UE 210 may receive services through a PDU session, which may be a logical connection between the UE 210 and a DN. The PDU session may have one or more QoS flows. A UPF of a CN (e.g., the UPF 158B) may map IP packets to the one or more QoS flows of the PDU session based on QoS requirements (e.g., in terms of delay, data rate, and/or error rate). The SDAPs 215 and 225 may perform mapping/de-mapping between the one or more QoS flows and one or more data radio bearers. The mapping/de-mapping between the QoS flows and the data radio bearers may be determined by the SDAP 225 at the gNB 220. The SDAP 215 at the UE 210 may be informed of the mapping between the QoS flows and the data radio bearers through reflective mapping or control signaling received from the gNB 220. For reflective mapping, the SDAP 225 at the gNB 220 may mark the downlink packets with a QoS flow indicator (QFI), which may be observed by the SDAP 215 at the UE 210 to determine the mapping/de-mapping between the QoS flows and the data radio bearers.

The PDCPs 214 and 224 may perform header compression/decompression to reduce the amount of data that needs to be transmitted over the air interface, ciphering/deciphering to prevent unauthorized decoding of data transmitted over the air interface, and integrity protection (to ensure control messages originate from intended sources. The PDCPs 214 and 224 may perform retransmissions of undelivered packets, in-sequence delivery and reordering of packets, and removal of packets received in duplicate due to, for example, an intra-gNB handover. The PDCPs 214 and 224 may perform packet duplication to improve the likelihood of the packet being received and, at the receiver, remove any duplicate packets. Packet duplication may be useful for services that require high reliability.

Although not shown in FIG. 3 , PDCPs 214 and 224 may perform mapping/de-mapping between a split radio bearer and RLC channels in a dual connectivity scenario. Dual connectivity is a technique that allows a UE to connect to two cells or, more generally, two cell groups: a master cell group (MCG) and a secondary cell group (SCG). A split bearer is when a single radio bearer, such as one of the radio bearers provided by the PDCPs 214 and 224 as a service to the SDAPs 215 and 225, is handled by cell groups in dual connectivity. The PDCPs 214 and 224 may map/de-map the split radio bearer between RLC channels belonging to cell groups.

The RLCs 213 and 223 may perform segmentation, retransmission through Automatic Repeat Request (ARQ), and removal of duplicate data units received from MACs 212 and 222, respectively. The RLCs 213 and 223 may support three transmission modes: transparent mode (TM); unacknowledged mode (UM); and acknowledged mode (AM). Based on the transmission mode an RLC is operating, the RLC may perform one or more of the noted functions. The RLC configuration may be per logical channel with no dependency on numerologies and/or Transmission Time Interval (TTI) durations. As shown in FIG. 3 , the RLCs 213 and 223 may provide RLC channels as a service to PDCPs 214 and 224, respectively.

The MACs 212 and 222 may perform multiplexing/demultiplexing of logical channels and/or mapping between logical channels and transport channels. The multiplexing/demultiplexing may include multiplexing/demultiplexing of data units, belonging to the one or more logical channels, into/from Transport Blocks (TB s) delivered to/from the PHYs 211 and 221. The MAC 222 may be configured to perform scheduling, scheduling information reporting, and priority handling between UEs by means of dynamic scheduling. Scheduling may be performed in the gNB 220 (at the MAC 222) for downlink and uplink. The MACs 212 and 222 may be configured to perform error correction through Hybrid Automatic Repeat Request (HARQ) (e.g., one HARQ entity per carrier in case of Carrier Aggregation (CA)), priority handling between logical channels of the UE 210 by means of logical channel prioritization, and/or padding. The MACs 212 and 222 may support one or more numerologies and/or transmission timings. In an example, mapping restrictions in a logical channel prioritization may control which numerology and/or transmission timing a logical channel may use. As shown in FIG. 3 , the MACs 212 and 222 may provide logical channels as a service to the RLCs 213 and 223.

The PHYs 211 and 221 may perform mapping of transport channels to physical channels and digital and analog signal processing functions for sending and receiving information over the air interface. These digital and analog signal processing functions may include, for example, coding/decoding and modulation/demodulation. The PHYs 211 and 221 may perform multi-antenna mapping. As shown in FIG. 3 , the PHYs 211 and 221 may provide one or more transport channels as a service to the MACs 212 and 222.

FIG. 4A illustrates an example downlink data flow through the NR user plane protocol stack. FIG. 4A illustrates a downlink data flow of three IP packets (n, n+1, and m) through the NR user plane protocol stack to generate two TBs at the gNB 220. An uplink data flow through the NR user plane protocol stack may be similar to the downlink data flow depicted in FIG. 4A.

The downlink data flow of FIG. 4A begins when SDAP 225 receives the three IP packets from one or more QoS flows and maps the three packets to radio bearers. In FIG. 4A, the SDAP 225 maps IP packets n and n+1 to a first radio bearer 402 and maps IP packet m to a second radio bearer 404. An SDAP header (labeled with an “H” in FIG. 4A) is added to an IP packet. The data unit from/to a higher protocol layer is referred to as a service data unit (SDU) of the lower protocol layer and the data unit to/from a lower protocol layer is referred to as a protocol data unit (PDU) of the higher protocol layer. As shown in FIG. 4A, the data unit from the SDAP 225 is an SDU of lower protocol layer PDCP 224 and is a PDU of the SDAP 225.

The remaining protocol layers in FIG. 4A may perform their associated functionality (e.g., with respect to FIG. 3 ), add corresponding headers, and forward their respective outputs to the next lower layer. For example, the PDCP 224 may perform IP-header compression and ciphering and forward its output to the RLC 223. The RLC 223 may optionally perform segmentation (e.g., as shown for IP packet m in FIG. 4A) and forward its output to the MAC 222. The MAC 222 may multiplex a number of RLC PDUs and may attach a MAC subheader to an RLC PDU to form a transport block. In NR, the MAC subheaders may be distributed across the MAC PDU, as illustrated in FIG. 4A. In LTE, the MAC subheaders may be entirely located at the beginning of the MAC PDU. The NR MAC PDU structure may reduce processing time and associated latency because the MAC PDU subheaders may be computed before the full MAC PDU is assembled.

FIG. 4B illustrates an example format of a MAC subheader in a MAC PDU. The MAC subheader includes: an SDU length field for indicating the length (e.g., in bytes) of the MAC SDU to which the MAC subheader corresponds; a logical channel identifier (LCID) field for identifying the logical channel from which the MAC SDU originated to aid in the demultiplexing process; a flag (F) for indicating the size of the SDU length field; and a reserved bit (R) field for future use.

FIG. 4B further illustrates MAC control elements (CEs) inserted into the MAC PDU by a MAC, such as MAC 223 or MAC 222. For example, FIG. 4B illustrates two MAC CEs inserted into the MAC PDU. MAC CEs may be inserted at the beginning of a MAC PDU for downlink transmissions (as shown in FIG. 4B) and at the end of a MAC PDU for uplink transmissions. MAC CEs may be used for in-band control signaling. Example MAC CEs include: scheduling-related MAC CEs, such as buffer status reports and power headroom reports; activation/deactivation MAC CEs, such as those for activation/deactivation of PDCP duplication detection, channel state information (CSI) reporting, sounding reference signal (SRS) transmission, and prior configured components; discontinuous reception (DRX) related MAC CEs; timing advance MAC CEs; and random access related MAC CEs. A MAC CE may be preceded by a MAC subheader with a similar format as described for MAC SDUs and may be identified with a reserved value in the LCID field that indicates the type of control information included in the MAC CE.

Before describing the NR control plane protocol stack, logical channels, transport channels, and physical channels are first described as well as a mapping between the channel types. One or more of the channels may be used to carry out functions associated with the NR control plane protocol stack described later below.

FIG. 5A and FIG. 5B illustrate, for downlink and uplink respectively, a mapping between logical channels, transport channels, and physical channels. Information is passed through channels between the RLC, the MAC, and the PHY of the NR protocol stack. A logical channel may be used between the RLC and the MAC and may be classified as a control channel that carries control and configuration information in the NR control plane or as a traffic channel that carries data in the NR user plane. A logical channel may be classified as a dedicated logical channel that is dedicated to a specific UE or as a common logical channel that may be used by more than one UE. A logical channel may also be defined by the type of information it carries. The set of logical channels defined by NR include, for example:

-   -   a paging control channel (PCCH) for carrying paging messages         used to page a UE whose location is not known to the network on         a cell level;     -   a broadcast control channel (BCCH) for carrying system         information messages in the form of a master information block         (MIB) and several system information blocks (SIBs), wherein the         system information messages may be used by the UEs to obtain         information about how a cell is configured and how to operate         within the cell;     -   a common control channel (CCCH) for carrying control messages         together with random access;     -   a dedicated control channel (DCCH) for carrying control messages         to/from a specific the UE to configure the UE; and     -   a dedicated traffic channel (DTCH) for carrying user data         to/from a specific the UE.

Transport channels are used between the MAC and PHY layers and may be defined by how the information they carry is transmitted over the air interface. The set of transport channels defined by NR include, for example:

-   -   a paging channel (PCH) for carrying paging messages that         originated from the PCCH;     -   a broadcast channel (BCH) for carrying the MIB from the BCCH;     -   a downlink shared channel (DL-SCH) for carrying downlink data         and signaling messages, including the SIBs from the BCCH;     -   an uplink shared channel (UL-SCH) for carrying uplink data and         signaling messages; and     -   a random access channel (RACH) for allowing a UE to contact the         network without any prior scheduling.

The PHY may use physical channels to pass information between processing levels of the PHY. A physical channel may have an associated set of time-frequency resources for carrying the information of one or more transport channels. The PHY may generate control information to support the low-level operation of the PHY and provide the control information to the lower levels of the PHY via physical control channels, known as L1/L2 control channels. The set of physical channels and physical control channels defined by NR include, for example:

-   -   a physical broadcast channel (PBCH) for carrying the MIB from         the BCH;     -   a physical downlink shared channel (PDSCH) for carrying downlink         data and signaling messages from the DL-SCH, as well as paging         messages from the PCH;     -   a physical downlink control channel (PDCCH) for carrying         downlink control information (DCI), which may include downlink         scheduling commands, uplink scheduling grants, and uplink power         control commands;     -   a physical uplink shared channel (PUSCH) for carrying uplink         data and signaling messages from the UL-SCH and in some         instances uplink control information (UCI) as described below;     -   a physical uplink control channel (PUCCH) for carrying UCI,         which may include HARQ acknowledgments, channel quality         indicators (CQI), pre-coding matrix indicators (PMI), rank         indicators (RI), and scheduling requests (SR); and     -   a physical random access channel (PRACH) for random access.

Similar to the physical control channels, the physical layer generates physical signals to support the low-level operation of the physical layer. As shown in FIG. 5A and FIG. 5B, the physical layer signals defined by NR include: primary synchronization signals (PSS), secondary synchronization signals (SSS), channel state information reference signals (CSI-RS), demodulation reference signals (DMRS), sounding reference signals (SRS), and phase-tracking reference signals (PT-RS). These physical layer signals will be described in greater detail below.

FIG. 2B illustrates an example NR control plane protocol stack. As shown in FIG. 2B, the NR control plane protocol stack may use the same/similar first four protocol layers as the example NR user plane protocol stack. These four protocol layers include the PHYs 211 and 221, the MACs 212 and 222, the RLCs 213 and 223, and the PDCPs 214 and 224. Instead of having the SDAPs 215 and 225 at the top of the stack as in the NR user plane protocol stack, the NR control plane stack has radio resource controls (RRCs) 216 and 226 and NAS protocols 217 and 237 at the top of the NR control plane protocol stack.

The NAS protocols 217 and 237 may provide control plane functionality between the UE 210 and the AMF 230 (e.g., the AMF 158A) or, more generally, between the UE 210 and the CN. The NAS protocols 217 and 237 may provide control plane functionality between the UE 210 and the AMF 230 via signaling messages, referred to as NAS messages. There is no direct path between the UE 210 and the AMF 230 through which the NAS messages can be transported. The NAS messages may be transported using the AS of the Uu and NG interfaces. NAS protocols 217 and 237 may provide control plane functionality such as authentication, security, connection setup, mobility management, and session management.

The RRCs 216 and 226 may provide control plane functionality between the UE 210 and the gNB 220 or, more generally, between the UE 210 and the RAN. The RRCs 216 and 226 may provide control plane functionality between the UE 210 and the gNB 220 via signaling messages, referred to as RRC messages. RRC messages may be transmitted between the UE 210 and the RAN using signaling radio bearers and the same/similar PDCP, RLC, MAC, and PHY protocol layers. The MAC may multiplex control-plane and user-plane data into the same transport block (TB). The RRCs 216 and 226 may provide control plane functionality such as: broadcast of system information related to AS and NAS; paging initiated by the CN or the RAN; establishment, maintenance and release of an RRC connection between the UE 210 and the RAN; security functions including key management; establishment, configuration, maintenance and release of signaling radio bearers and data radio bearers; mobility functions; QoS management functions; the UE measurement reporting and control of the reporting; detection of and recovery from radio link failure (RLF); and/or NAS message transfer. As part of establishing an RRC connection, RRCs 216 and 226 may establish an RRC context, which may involve configuring parameters for communication between the UE 210 and the RAN.

FIG. 6 is an example diagram showing RRC state transitions of a UE. The UE may be the same or similar to the wireless device 106 depicted in FIG. 1A, the UE 210 depicted in FIG. 2A and FIG. 2B, or any other wireless device described in the present disclosure. As illustrated in FIG. 6 , a UE may be in at least one of three RRC states: RRC connected 602 (e.g., RRC_CONNECTED), RRC idle 604 (e.g., RRC_IDLE), and RRC inactive 606 (e.g., RRC_INACTIVE).

In RRC connected 602, the UE has an established RRC context and may have at least one RRC connection with a base station. The base station may be similar to one of the one or more base stations included in the RAN 104 depicted in FIG. 1A, one of the gNBs 160 or ng-eNBs 162 depicted in FIG. 1B, the gNB 220 depicted in FIG. 2A and FIG. 2B, or any other base station described in the present disclosure. The base station with which the UE is connected may have the RRC context for the UE. The RRC context, referred to as the UE context, may comprise parameters for communication between the UE and the base station. These parameters may include, for example: one or more AS contexts; one or more radio link configuration parameters; bearer configuration information (e.g., relating to a data radio bearer, signaling radio bearer, logical channel, QoS flow, and/or PDU session); security information; and/or PHY, MAC, RLC, PDCP, and/or SDAP layer configuration information. While in RRC connected 602, mobility of the UE may be managed by the RAN (e.g., the RAN 104 or the NG-RAN 154). The UE may measure the signal levels (e.g., reference signal levels) from a serving cell and neighboring cells and report these measurements to the base station currently serving the UE. The UE's serving base station may request a handover to a cell of one of the neighboring base stations based on the reported measurements. The RRC state may transition from RRC connected 602 to RRC idle 604 through a connection release procedure 608 or to RRC inactive 606 through a connection inactivation procedure 610.

In RRC idle 604, an RRC context may not be established for the UE. In RRC idle 604, the UE may not have an RRC connection with the base station. While in RRC idle 604, the UE may be in a sleep state for the majority of the time (e.g., to conserve battery power). The UE may wake up periodically (e.g., once in every discontinuous reception cycle) to monitor for paging messages from the RAN. Mobility of the UE may be managed by the UE through a procedure known as cell reselection. The RRC state may transition from RRC idle 604 to RRC connected 602 through a connection establishment procedure 612, which may involve a random access procedure as discussed in greater detail below.

In RRC inactive 606, the RRC context previously established is maintained in the UE and the base station. This allows for a fast transition to RRC connected 602 with reduced signaling overhead as compared to the transition from RRC idle 604 to RRC connected 602. While in RRC inactive 606, the UE may be in a sleep state and mobility of the UE may be managed by the UE through cell reselection. The RRC state may transition from RRC inactive 606 to RRC connected 602 through a connection resume procedure 614 or to RRC idle 604 though a connection release procedure 616 that may be the same as or similar to connection release procedure 608.

An RRC state may be associated with a mobility management mechanism. In RRC idle 604 and RRC inactive 606, mobility is managed by the UE through cell reselection. The purpose of mobility management in RRC idle 604 and RRC inactive 606 is to allow the network to be able to notify the UE of an event via a paging message without having to broadcast the paging message over the entire mobile communications network. The mobility management mechanism used in RRC idle 604 and RRC inactive 606 may allow the network to track the UE on a cell-group level so that the paging message may be broadcast over the cells of the cell group that the UE currently resides within instead of the entire mobile communication network. The mobility management mechanisms for RRC idle 604 and RRC inactive 606 track the UE on a cell-group level. They may do so using different granularities of grouping. For example, there may be three levels of cell-grouping granularity: individual cells; cells within a RAN area identified by a RAN area identifier (RAI); and cells within a group of RAN areas, referred to as a tracking area and identified by a tracking area identifier (TAI).

Tracking areas may be used to track the UE at the CN level. The CN (e.g., the CN 102 or the 5G-CN 152) may provide the UE with a list of TAIs associated with a UE registration area. If the UE moves, through cell reselection, to a cell associated with a TAI not included in the list of TAIs associated with the UE registration area, the UE may perform a registration update with the CN to allow the CN to update the UE's location and provide the UE with a new the UE registration area.

RAN areas may be used to track the UE at the RAN level. For a UE in RRC inactive 606 state, the UE may be assigned a RAN notification area. A RAN notification area may comprise one or more cell identities, a list of RAIs, or a list of TAIs. In an example, a base station may belong to one or more RAN notification areas. In an example, a cell may belong to one or more RAN notification areas. If the UE moves, through cell reselection, to a cell not included in the RAN notification area assigned to the UE, the UE may perform a notification area update with the RAN to update the UE's RAN notification area.

A base station storing an RRC context for a UE or a last serving base station of the UE may be referred to as an anchor base station. An anchor base station may maintain an RRC context for the UE at least during a period of time that the UE stays in a RAN notification area of the anchor base station and/or during a period of time that the UE stays in RRC inactive 606.

A gNB, such as gNBs 160 in FIG. 1B, may be split in two parts: a central unit (gNB-CU), and one or more distributed units (gNB-DU). A gNB-CU may be coupled to one or more gNB-DUs using an F1 interface. The gNB-CU may comprise the RRC, the PDCP, and the SDAP. A gNB-DU may comprise the RLC, the MAC, and the PHY.

In NR, the physical signals and physical channels (discussed with respect to FIG. 5A and FIG. 5B) may be mapped onto orthogonal frequency divisional multiplexing (OFDM) symbols. OFDM is a multicarrier communication scheme that transmits data over F orthogonal subcarriers (or tones). Before transmission, the data may be mapped to a series of complex symbols (e.g., M-quadrature amplitude modulation (M-QAM) or M-phase shift keying (M-PSK) symbols), referred to as source symbols, and divided into F parallel symbol streams. The F parallel symbol streams may be treated as though they are in the frequency domain and used as inputs to an Inverse Fast Fourier Transform (IFFT) block that transforms them into the time domain. The IFFT block may take in F source symbols at a time, one from each of the F parallel symbol streams, and use each source symbol to modulate the amplitude and phase of one of F sinusoidal basis functions that correspond to the F orthogonal subcarriers. The output of the IFFT block may be F time-domain samples that represent the summation of the F orthogonal subcarriers. The F time-domain samples may form a single OFDM symbol. After some processing (e.g., addition of a cyclic prefix) and up-conversion, an OFDM symbol provided by the IFFT block may be transmitted over the air interface on a carrier frequency. The F parallel symbol streams may be mixed using an FFT block before being processed by the IFFT block. This operation produces Discrete Fourier Transform (DFT)-precoded OFDM symbols and may be used by UEs in the uplink to reduce the peak to average power ratio (PAPR). Inverse processing may be performed on the OFDM symbol at a receiver using an FFT block to recover the data mapped to the source symbols.

FIG. 7 illustrates an example configuration of an NR frame into which OFDM symbols are grouped. An NR frame may be identified by a system frame number (SFN). The SFN may repeat with a period of 1024 frames. As illustrated, one NR frame may be 10 milliseconds (ms) in duration and may include 10 subframes that are 1 ms in duration. A subframe may be divided into slots that include, for example, 14 OFDM symbols per slot.

The duration of a slot may depend on the numerology used for the OFDM symbols of the slot. In NR, a flexible numerology is supported to accommodate different cell deployments (e.g., cells with carrier frequencies below 1 GHz up to cells with carrier frequencies in the mm-wave range). A numerology may be defined in terms of subcarrier spacing and cyclic prefix duration. For a numerology in NR, subcarrier spacings may be scaled up by powers of two from a baseline subcarrier spacing of 15 kHz, and cyclic prefix durations may be scaled down by powers of two from a baseline cyclic prefix duration of 4.7 μs. For example, NR defines numerologies with the following subcarrier spacing/cyclic prefix duration combinations: 15 kHz/4.7 μs; 30 kHz/2.3 μs; 60 kHz/1.2 μs; 120 kHz/0.59 μs; and 240 kHz/0.29 μs.

A slot may have a fixed number of OFDM symbols (e.g., 14 OFDM symbols). A numerology with a higher subcarrier spacing has a shorter slot duration and, correspondingly, more slots per subframe. FIG. 7 illustrates this numerology-dependent slot duration and slots-per-subframe transmission structure (the numerology with a subcarrier spacing of 240 kHz is not shown in FIG. 7 for ease of illustration). A subframe in NR may be used as a numerology-independent time reference, while a slot may be used as the unit upon which uplink and downlink transmissions are scheduled. To support low latency, scheduling in NR may be decoupled from the slot duration and start at any OFDM symbol and last for as many symbols as needed for a transmission. These partial slot transmissions may be referred to as mini-slot or subslot transmissions.

FIG. 8 illustrates an example configuration of a slot in the time and frequency domain for an NR carrier. The slot includes resource elements (REs) and resource blocks (RBs). An RE is the smallest physical resource in NR. An RE spans one OFDM symbol in the time domain by one subcarrier in the frequency domain as shown in FIG. 8 . An RB spans twelve consecutive REs in the frequency domain as shown in FIG. 8 . An NR carrier may be limited to a width of 275 RBs or 275×12=3300 subcarriers. Such a limitation, if used, may limit the NR carrier to 50, 100, 200, and 400 MHz for subcarrier spacings of 15, 30, 60, and 120 kHz, respectively, where the 400 MHz bandwidth may be set based on a 400 MHz per carrier bandwidth limit.

FIG. 8 illustrates a single numerology being used across the entire bandwidth of the NR carrier. In other example configurations, multiple numerologies may be supported on the same carrier.

NR may support wide carrier bandwidths (e.g., up to 400 MHz for a subcarrier spacing of 120 kHz). Not all UEs may be able to receive the full carrier bandwidth (e.g., due to hardware limitations). Also, receiving the full carrier bandwidth may be prohibitive in terms of UE power consumption. In an example, to reduce power consumption and/or for other purposes, a UE may adapt the size of the UE's receive bandwidth based on the amount of traffic the UE is scheduled to receive. This is referred to as bandwidth adaptation.

NR defines bandwidth parts (BWPs) to support UEs not capable of receiving the full carrier bandwidth and to support bandwidth adaptation. In an example, a BWP may be defined by a subset of contiguous RBs on a carrier. A UE may be configured (e.g., via RRC layer) with one or more downlink BWPs and one or more uplink BWPs per serving cell (e.g., up to four downlink BWPs and up to four uplink BWPs per serving cell). At a given time, one or more of the configured BWPs for a serving cell may be active. These one or more BWPs may be referred to as active BWPs of the serving cell. When a serving cell is configured with a secondary uplink carrier, the serving cell may have one or more first active BWPs in the uplink carrier and one or more second active BWPs in the secondary uplink carrier.

For unpaired spectra, a downlink BWP from a set of configured downlink BWPs may be linked with an uplink BWP from a set of configured uplink BWPs if a downlink BWP index of the downlink BWP and an uplink BWP index of the uplink BWP are the same. For unpaired spectra, a UE may expect that a center frequency for a downlink BWP is the same as a center frequency for an uplink BWP.

For a downlink BWP in a set of configured downlink BWPs on a primary cell (PCell), a base station may configure a UE with one or more control resource sets (CORESETs) for at least one search space. A search space is a set of locations in the time and frequency domains where the UE may find control information. The search space may be a UE-specific search space or a common search space (potentially usable by a plurality of UEs). For example, a base station may configure a UE with a common search space, on a PCell or on a primary secondary cell (PSCell), in an active downlink BWP.

For an uplink BWP in a set of configured uplink BWPs, a BS may configure a UE with one or more resource sets for one or more PUCCH transmissions. A UE may receive downlink receptions (e.g., PDCCH or PDSCH) in a downlink BWP according to a configured numerology (e.g., subcarrier spacing and cyclic prefix duration) for the downlink BWP. The UE may transmit uplink transmissions (e.g., PUCCH or PUSCH) in an uplink BWP according to a configured numerology (e.g., subcarrier spacing and cyclic prefix length for the uplink BWP).

One or more BWP indicator fields may be provided in Downlink Control Information (DCI). A value of a BWP indicator field may indicate which BWP in a set of configured BWPs is an active downlink BWP for one or more downlink receptions. The value of the one or more BWP indicator fields may indicate an active uplink BWP for one or more uplink transmissions.

A base station may semi-statically configure a UE with a default downlink BWP within a set of configured downlink BWPs associated with a PCell. If the base station does not provide the default downlink BWP to the UE, the default downlink BWP may be an initial active downlink BWP. The UE may determine which BWP is the initial active downlink BWP based on a CORESET configuration obtained using the PBCH.

A base station may configure a UE with a BWP inactivity timer value for a PCell. The UE may start or restart a BWP inactivity timer at any appropriate time. For example, the UE may start or restart the BWP inactivity timer (a) when the UE detects a DCI indicating an active downlink BWP other than a default downlink BWP for a paired spectra operation; or (b) when a UE detects a DCI indicating an active downlink BWP or active uplink BWP other than a default downlink BWP or uplink BWP for an unpaired spectra operation. If the UE does not detect DCI during an interval of time (e.g., 1 ms or 0.5 ms), the UE may run the BWP inactivity timer toward expiration (for example, increment from zero to the BWP inactivity timer value, or decrement from the BWP inactivity timer value to zero). When the BWP inactivity timer expires, the UE may switch from the active downlink BWP to the default downlink BWP.

In an example, a base station may semi-statically configure a UE with one or more BWPs. A UE may switch an active BWP from a first BWP to a second BWP in response to receiving a DCI indicating the second BWP as an active BWP and/or in response to an expiry of the BWP inactivity timer (e.g., if the second BWP is the default BWP).

Downlink and uplink BWP switching (where BWP switching refers to switching from a currently active BWP to a not currently active BWP) may be performed independently in paired spectra. In unpaired spectra, downlink and uplink BWP switching may be performed simultaneously. Switching between configured BWPs may occur based on RRC signaling, DCI, expiration of a BWP inactivity timer, and/or an initiation of random access.

FIG. 9 illustrates an example of bandwidth adaptation using three configured BWPs for an NR carrier. A UE configured with the three BWPs may switch from one BWP to another BWP at a switching point. In the example illustrated in FIG. 9 , the BWPs include: a BWP 902 with a bandwidth of 40 MHz and a subcarrier spacing of 15 kHz; a BWP 904 with a bandwidth of 10 MHz and a subcarrier spacing of 15 kHz; and a BWP 906 with a bandwidth of 20 MHz and a subcarrier spacing of 60 kHz. The BWP 902 may be an initial active BWP, and the BWP 904 may be a default BWP. The UE may switch between BWPs at switching points. In the example of FIG. 9 , the UE may switch from the BWP 902 to the BWP 904 at a switching point 908. The switching at the switching point 908 may occur for any suitable reason, for example, in response to an expiry of a BWP inactivity timer (indicating switching to the default BWP) and/or in response to receiving a DCI indicating BWP 904 as the active BWP. The UE may switch at a switching point 910 from active BWP 904 to BWP 906 in response receiving a DCI indicating BWP 906 as the active BWP. The UE may switch at a switching point 912 from active BWP 906 to BWP 904 in response to an expiry of a BWP inactivity timer and/or in response receiving a DCI indicating BWP 904 as the active BWP. The UE may switch at a switching point 914 from active BWP 904 to BWP 902 in response receiving a DCI indicating BWP 902 as the active BWP.

If a UE is configured for a secondary cell with a default downlink BWP in a set of configured downlink BWPs and a timer value, UE procedures for switching BWPs on a secondary cell may be the same/similar as those on a primary cell. For example, the UE may use the timer value and the default downlink BWP for the secondary cell in the same/similar manner as the UE would use these values for a primary cell.

To provide for greater data rates, two or more carriers can be aggregated and simultaneously transmitted to/from the same UE using carrier aggregation (CA). The aggregated carriers in CA may be referred to as component carriers (CCs). When CA is used, there are a number of serving cells for the UE, one for a CC. The CCs may have three configurations in the frequency domain.

FIG. 10A illustrates the three CA configurations with two CCs. In the intraband, contiguous configuration 1002, the two CCs are aggregated in the same frequency band (frequency band A) and are located directly adjacent to each other within the frequency band. In the intraband, non-contiguous configuration 1004, the two CCs are aggregated in the same frequency band (frequency band A) and are separated in the frequency band by a gap. In the interband configuration 1006, the two CCs are located in frequency bands (frequency band A and frequency band B).

In an example, up to 32 CCs may be aggregated. The aggregated CCs may have the same or different bandwidths, subcarrier spacing, and/or duplexing schemes (TDD or FDD). A serving cell for a UE using CA may have a downlink CC. For FDD, one or more uplink CCs may be optionally configured for a serving cell. The ability to aggregate more downlink carriers than uplink carriers may be useful, for example, when the UE has more data traffic in the downlink than in the uplink.

When CA is used, one of the aggregated cells for a UE may be referred to as a primary cell (PCell). The PCell may be the serving cell that the UE initially connects to at RRC connection establishment, reestablishment, and/or handover. The PCell may provide the UE with NAS mobility information and the security input. UEs may have different PCells. In the downlink, the carrier corresponding to the PCell may be referred to as the downlink primary CC (DL PCC). In the uplink, the carrier corresponding to the PCell may be referred to as the uplink primary CC (UL PCC). The other aggregated cells for the UE may be referred to as secondary cells (SCells). In an example, the SCells may be configured after the PCell is configured for the UE. For example, an SCell may be configured through an RRC Connection Reconfiguration procedure. In the downlink, the carrier corresponding to an SCell may be referred to as a downlink secondary CC (DL SCC). In the uplink, the carrier corresponding to the SCell may be referred to as the uplink secondary CC (UL SCC).

Configured SCells for a UE may be activated and deactivated based on, for example, traffic and channel conditions. Deactivation of an SCell may mean that PDCCH and PDSCH reception on the SCell is stopped and PUSCH, SRS, and CQI transmissions on the SCell are stopped. Configured SCells may be activated and deactivated using a MAC CE with respect to FIG. 4B. For example, a MAC CE may use a bitmap (e.g., one bit per SCell) to indicate which SCells (e.g., in a subset of configured SCells) for the UE are activated or deactivated. Configured SCells may be deactivated in response to an expiration of an SCell deactivation timer (e.g., one SCell deactivation timer per SCell).

Downlink control information, such as scheduling assignments and scheduling grants, for a cell may be transmitted on the cell corresponding to the assignments and grants, which is known as self-scheduling. The DCI for the cell may be transmitted on another cell, which is known as cross-carrier scheduling. Uplink control information (e.g., HARQ acknowledgments and channel state feedback, such as CQI, PMI, and/or RI) for aggregated cells may be transmitted on the PUCCH of the PCell. For a larger number of aggregated downlink CCs, the PUCCH of the PCell may become overloaded. Cells may be divided into multiple PUCCH groups.

FIG. 10B illustrates an example of how aggregated cells may be configured into one or more PUCCH groups. A PUCCH group 1010 and a PUCCH group 1050 may include one or more downlink CCs, respectively. In the example of FIG. 10B, the PUCCH group 1010 includes three downlink CCs: a PCell 1011, an SCell 1012, and an SCell 1013. The PUCCH group 1050 includes three downlink CCs in the present example: a PCell 1051, an SCell 1052, and an SCell 1053. One or more uplink CCs may be configured as a PCell 1021, an SCell 1022, and an SCell 1023. One or more other uplink CCs may be configured as a primary Scell (PSCell) 1061, an SCell 1062, and an SCell 1063. Uplink control information (UCI) related to the downlink CCs of the PUCCH group 1010, shown as UCI 1031, UCI 1032, and UCI 1033, may be transmitted in the uplink of the PCell 1021. Uplink control information (UCI) related to the downlink CCs of the PUCCH group 1050, shown as UCI 1071, UCI 1072, and UCI 1073, may be transmitted in the uplink of the PSCell 1061. In an example, if the aggregated cells depicted in FIG. 10B were not divided into the PUCCH group 1010 and the PUCCH group 1050, a single uplink PCell to transmit UCI relating to the downlink CCs, and the PCell may become overloaded. By dividing transmissions of UCI between the PCell 1021 and the PSCell 1061, overloading may be prevented.

A cell, comprising a downlink carrier and optionally an uplink carrier, may be assigned with a physical cell ID and a cell index. The physical cell ID or the cell index may identify a downlink carrier and/or an uplink carrier of the cell, for example, depending on the context in which the physical cell ID is used. A physical cell ID may be determined using a synchronization signal transmitted on a downlink component carrier. A cell index may be determined using RRC messages. In the disclosure, a physical cell ID may be referred to as a carrier ID, and a cell index may be referred to as a carrier index. For example, when the disclosure refers to a first physical cell ID for a first downlink carrier, the disclosure may mean the first physical cell ID is for a cell comprising the first downlink carrier. The same/similar concept may apply to, for example, a carrier activation. When the disclosure indicates that a first carrier is activated, the specification may mean that a cell comprising the first carrier is activated.

In CA, a multi-carrier nature of a PHY may be exposed to a MAC. In an example, a HARQ entity may operate on a serving cell. A transport block may be generated per assignment/grant per serving cell. A transport block and potential HARQ retransmissions of the transport block may be mapped to a serving cell.

In the downlink, a base station may transmit (e.g., unicast, multicast, and/or broadcast) one or more Reference Signals (RSs) to a UE (e.g., PSS, SSS, CSI-RS, DMRS, and/or PT-RS, as shown in FIG. 5A). In the uplink, the UE may transmit one or more RSs to the base station (e.g., DMRS, PT-RS, and/or SRS, as shown in FIG. 5B). The PSS and the SSS may be transmitted by the base station and used by the UE to synchronize the UE to the base station. The PSS and the SSS may be provided in a synchronization signal (SS)/physical broadcast channel (PBCH) block that includes the PSS, the SSS, and the PBCH. The base station may periodically transmit a burst of SS/PBCH blocks.

FIG. 11A illustrates an example of an SS/PBCH block's structure and location. A burst of SS/PBCH blocks may include one or more SS/PBCH blocks (e.g., 4 SS/PBCH blocks, as shown in FIG. 11A). Bursts may be transmitted periodically (e.g., every 2 frames or 20 ms). A burst may be restricted to a half-frame (e.g., a first half-frame having a duration of 5 ms). It will be understood that FIG. 11A is an example, and that these parameters (number of SS/PBCH blocks per burst, periodicity of bursts, position of burst within the frame) may be configured based on, for example: a carrier frequency of a cell in which the SS/PBCH block is transmitted; a numerology or subcarrier spacing of the cell; a configuration by the network (e.g., using RRC signaling); or any other suitable factor. In an example, the UE may assume a subcarrier spacing for the SS/PBCH block based on the carrier frequency being monitored, unless the radio network configured the UE to assume a different subcarrier spacing.

The SS/PBCH block may span one or more OFDM symbols in the time domain (e.g., 4 OFDM symbols, as shown in the example of FIG. 11A) and may span one or more subcarriers in the frequency domain (e.g., 240 contiguous subcarriers). The PSS, the SSS, and the PBCH may have a common center frequency. The PSS may be transmitted first and may span, for example, 1 OFDM symbol and 127 subcarriers. The SSS may be transmitted after the PSS (e.g., two symbols later) and may span 1 OFDM symbol and 127 subcarriers. The PBCH may be transmitted after the PSS (e.g., across the next 3 OFDM symbols) and may span 240 subcarriers.

The location of the SS/PBCH block in the time and frequency domains may not be known to the UE (e.g., if the UE is searching for the cell). To find and select the cell, the UE may monitor a carrier for the PSS. For example, the UE may monitor a frequency location within the carrier. If the PSS is not found after a certain duration (e.g., 20 ms), the UE may search for the PSS at a different frequency location within the carrier, as indicated by a synchronization raster. If the PSS is found at a location in the time and frequency domains, the UE may determine, based on a known structure of the SS/PBCH block, the locations of the SSS and the PBCH, respectively. The SS/PBCH block may be a cell-defining SS block (CD-SSB). In an example, a primary cell may be associated with a CD-SSB. The CD-SSB may be located on a synchronization raster. In an example, a cell selection/search and/or reselection may be based on the CD-SSB.

The SS/PBCH block may be used by the UE to determine one or more parameters of the cell. For example, the UE may determine a physical cell identifier (PCI) of the cell based on the sequences of the PSS and the SSS, respectively. The UE may determine a location of a frame boundary of the cell based on the location of the SS/PBCH block. For example, the SS/PBCH block may indicate that it has been transmitted in accordance with a transmission pattern, wherein a SS/PBCH block in the transmission pattern is a known distance from the frame boundary.

The PBCH may use a QPSK modulation and may use forward error correction (FEC). The FEC may use polar coding. One or more symbols spanned by the PBCH may carry one or more DMRSs for demodulation of the PBCH. The PBCH may include an indication of a current system frame number (SFN) of the cell and/or a SS/PBCH block timing index. These parameters may facilitate time synchronization of the UE to the base station. The PBCH may include a master information block (MIB) used to provide the UE with one or more parameters. The MIB may be used by the UE to locate remaining minimum system information (RMSI) associated with the cell. The RMSI may include a System Information Block Type 1 (SIB1). The SIB1 may contain information needed by the UE to access the cell. The UE may use one or more parameters of the MIB to monitor PDCCH, which may be used to schedule PDSCH. The PDSCH may include the SIB1. The SIB1 may be decoded using parameters provided in the MIB. The PBCH may indicate an absence of SIB1. Based on the PBCH indicating the absence of SIB1, the UE may be pointed to a frequency. The UE may search for an SS/PBCH block at the frequency to which the UE is pointed.

The UE may assume that one or more SS/PBCH blocks transmitted with a same SS/PBCH block index are quasi co-located (QCLed) (e.g., having the same/similar Doppler spread, Doppler shift, average gain, average delay, and/or spatial Rx parameters). The UE may not assume QCL for SS/PBCH block transmissions having different SS/PBCH block indices.

SS/PBCH blocks (e.g., those within a half-frame) may be transmitted in spatial directions (e.g., using different beams that span a coverage area of the cell). In an example, a first SS/PBCH block may be transmitted in a first spatial direction using a first beam, and a second SS/PBCH block may be transmitted in a second spatial direction using a second beam.

In an example, within a frequency span of a carrier, a base station may transmit a plurality of SS/PBCH blocks. In an example, a first PCI of a first SS/PBCH block of the plurality of SS/PBCH blocks may be different from a second PCI of a second SS/PBCH block of the plurality of SS/PBCH blocks. The PCIs of SS/PBCH blocks transmitted in different frequency locations may be different or the same.

The CSI-RS may be transmitted by the base station and used by the UE to acquire channel state information (CSI). The base station may configure the UE with one or more CSI-RSs for channel estimation or any other suitable purpose. The base station may configure a UE with one or more of the same/similar CSI-RSs. The UE may measure the one or more CSI-RSs. The UE may estimate a downlink channel state and/or generate a CSI report based on the measuring of the one or more downlink CSI-RSs. The UE may provide the CSI report to the base station. The base station may use feedback provided by the UE (e.g., the estimated downlink channel state) to perform link adaptation.

The base station may semi-statically configure the UE with one or more CSI-RS resource sets. A CSI-RS resource may be associated with a location in the time and frequency domains and a periodicity. The base station may selectively activate and/or deactivate a CSI-RS resource. The base station may indicate to the UE that a CSI-RS resource in the CSI-RS resource set is activated and/or deactivated.

The base station may configure the UE to report CSI measurements. The base station may configure the UE to provide CSI reports periodically, aperiodically, or semi-persistently. For periodic CSI reporting, the UE may be configured with a timing and/or periodicity of a plurality of CSI reports. For aperiodic CSI reporting, the base station may request a CSI report. For example, the base station may command the UE to measure a configured CSI-RS resource and provide a CSI report relating to the measurements. For semi-persistent CSI reporting, the base station may configure the UE to transmit periodically, and selectively activate or deactivate the periodic reporting. The base station may configure the UE with a CSI-RS resource set and CSI reports using RRC signaling.

The CSI-RS configuration may comprise one or more parameters indicating, for example, up to 32 antenna ports. The UE may be configured to employ the same OFDM symbols for a downlink CSI-RS and a control resource set (CORESET) when the downlink CSI-RS and CORESET are spatially QCLed and resource elements associated with the downlink CSI-RS are outside of the physical resource blocks (PRBs) configured for the CORESET. The UE may be configured to employ the same OFDM symbols for downlink CSI-RS and SS/PBCH blocks when the downlink CSI-RS and SS/PBCH blocks are spatially QCLed and resource elements associated with the downlink CSI-RS are outside of PRBs configured for the SS/PBCH blocks.

Downlink DMRSs may be transmitted by a base station and used by a UE for channel estimation. For example, the downlink DMRS may be used for coherent demodulation of one or more downlink physical channels (e.g., PDSCH). An NR network may support one or more variable and/or configurable DMRS patterns for data demodulation. At least one downlink DMRS configuration may support a front-loaded DMRS pattern. A front-loaded DMRS may be mapped over one or more OFDM symbols (e.g., one or two adjacent OFDM symbols). A base station may semi-statically configure the UE with a number (e.g. a maximum number) of front-loaded DMRS symbols for PDSCH. A DMRS configuration may support one or more DMRS ports. For example, for single user-MIMO, a DMRS configuration may support up to eight orthogonal downlink DMRS ports per UE. For multiuser-MIMO, a DMRS configuration may support up to 4 orthogonal downlink DMRS ports per UE. A radio network may support (e.g., at least for CP-OFDM) a common DMRS structure for downlink and uplink, wherein a DMRS location, a DMRS pattern, and/or a scrambling sequence may be the same or different. The base station may transmit a downlink DMRS and a corresponding PDSCH using the same precoding matrix. The UE may use the one or more downlink DMRSs for coherent demodulation/channel estimation of the PDSCH.

In an example, a transmitter (e.g., a base station) may use a precoder matrices for a part of a transmission bandwidth. For example, the transmitter may use a first precoder matrix for a first bandwidth and a second precoder matrix for a second bandwidth. The first precoder matrix and the second precoder matrix may be different based on the first bandwidth being different from the second bandwidth. The UE may assume that a same precoding matrix is used across a set of PRBs. The set of PRBs may be denoted as a precoding resource block group (PRG).

A PDSCH may comprise one or more layers. The UE may assume that at least one symbol with DMRS is present on a layer of the one or more layers of the PDSCH. A higher layer may configure up to 3 DMRSs for the PDSCH.

Downlink PT-RS may be transmitted by a base station and used by a UE for phase-noise compensation. Whether a downlink PT-RS is present or not may depend on an RRC configuration. The presence and/or pattern of the downlink PT-RS may be configured on a UE-specific basis using a combination of RRC signaling and/or an association with one or more parameters employed for other purposes (e.g., modulation and coding scheme (MCS)), which may be indicated by DCI. When configured, a dynamic presence of a downlink PT-RS may be associated with one or more DCI parameters comprising at least MCS. An NR network may support a plurality of PT-RS densities defined in the time and/or frequency domains. When present, a frequency domain density may be associated with at least one configuration of a scheduled bandwidth. The UE may assume a same precoding for a DMRS port and a PT-RS port. A number of PT-RS ports may be fewer than a number of DMRS ports in a scheduled resource. Downlink PT-RS may be confined in the scheduled time/frequency duration for the UE. Downlink PT-RS may be transmitted on symbols to facilitate phase tracking at the receiver.

The UE may transmit an uplink DMRS to a base station for channel estimation. For example, the base station may use the uplink DMRS for coherent demodulation of one or more uplink physical channels. For example, the UE may transmit an uplink DMRS with a PUSCH and/or a PUCCH. The uplink DM-RS may span a range of frequencies that is similar to a range of frequencies associated with the corresponding physical channel. The base station may configure the UE with one or more uplink DMRS configurations. At least one DMRS configuration may support a front-loaded DMRS pattern. The front-loaded DMRS may be mapped over one or more OFDM symbols (e.g., one or two adjacent OFDM symbols). One or more uplink DMRSs may be configured to transmit at one or more symbols of a PUSCH and/or a PUCCH. The base station may semi-statically configure the UE with a number (e.g. maximum number) of front-loaded DMRS symbols for the PUSCH and/or the PUCCH, which the UE may use to schedule a single-symbol DMRS and/or a double-symbol DMRS. An NR network may support (e.g., for cyclic prefix orthogonal frequency division multiplexing (CP-OFDM)) a common DMRS structure for downlink and uplink, wherein a DMRS location, a DMRS pattern, and/or a scrambling sequence for the DMRS may be the same or different.

A PUSCH may comprise one or more layers, and the UE may transmit at least one symbol with DMRS present on a layer of the one or more layers of the PUSCH. In an example, a higher layer may configure up to three DMRSs for the PUSCH.

Uplink PT-RS (which may be used by a base station for phase tracking and/or phase-noise compensation) may or may not be present depending on an RRC configuration of the UE. The presence and/or pattern of uplink PT-RS may be configured on a UE-specific basis by a combination of RRC signaling and/or one or more parameters employed for other purposes (e.g., Modulation and Coding Scheme (MCS)), which may be indicated by DCI. When configured, a dynamic presence of uplink PT-RS may be associated with one or more DCI parameters comprising at least MCS. A radio network may support a plurality of uplink PT-RS densities defined in time/frequency domain. When present, a frequency domain density may be associated with at least one configuration of a scheduled bandwidth. The UE may assume a same precoding for a DMRS port and a PT-RS port. A number of PT-RS ports may be fewer than a number of DMRS ports in a scheduled resource. For example, uplink PT-RS may be confined in the scheduled time/frequency duration for the UE.

SRS may be transmitted by a UE to a base station for channel state estimation to support uplink channel dependent scheduling and/or link adaptation. SRS transmitted by the UE may allow a base station to estimate an uplink channel state at one or more frequencies. A scheduler at the base station may employ the estimated uplink channel state to assign one or more resource blocks for an uplink PUSCH transmission from the UE. The base station may semi-statically configure the UE with one or more SRS resource sets. For an SRS resource set, the base station may configure the UE with one or more SRS resources. An SRS resource set applicability may be configured by a higher layer (e.g., RRC) parameter. For example, when a higher layer parameter indicates beam management, an SRS resource in a SRS resource set of the one or more SRS resource sets (e.g., with the same/similar time domain behavior, periodic, aperiodic, and/or the like) may be transmitted at a time instant (e.g., simultaneously). The UE may transmit one or more SRS resources in SRS resource sets. An NR network may support aperiodic, periodic and/or semi-persistent SRS transmissions. The UE may transmit SRS resources based on one or more trigger types, wherein the one or more trigger types may comprise higher layer signaling (e.g., RRC) and/or one or more DCI formats. In an example, at least one DCI format may be employed for the UE to select at least one of one or more configured SRS resource sets. An SRS trigger type 0 may refer to an SRS triggered based on a higher layer signaling. An SRS trigger type 1 may refer to an SRS triggered based on one or more DCI formats. In an example, when PUSCH and SRS are transmitted in a same slot, the UE may be configured to transmit SRS after a transmission of a PUSCH and a corresponding uplink DMRS.

The base station may semi-statically configure the UE with one or more SRS configuration parameters indicating at least one of following: a SRS resource configuration identifier; a number of SRS ports; time domain behavior of an SRS resource configuration (e.g., an indication of periodic, semi-persistent, or aperiodic SRS); slot, mini-slot, and/or subframe level periodicity; offset for a periodic and/or an aperiodic SRS resource; a number of OFDM symbols in an SRS resource; a starting OFDM symbol of an SRS resource; an SRS bandwidth; a frequency hopping bandwidth; a cyclic shift; and/or an SRS sequence ID.

An antenna port is defined such that the channel over which a symbol on the antenna port is conveyed can be inferred from the channel over which another symbol on the same antenna port is conveyed. If a first symbol and a second symbol are transmitted on the same antenna port, the receiver may infer the channel (e.g., fading gain, multipath delay, and/or the like) for conveying the second symbol on the antenna port, from the channel for conveying the first symbol on the antenna port. A first antenna port and a second antenna port may be referred to as quasi co-located (QCLed) if one or more large-scale properties of the channel over which a first symbol on the first antenna port is conveyed may be inferred from the channel over which a second symbol on a second antenna port is conveyed. The one or more large-scale properties may comprise at least one of: a delay spread; a Doppler spread; a Doppler shift; an average gain; an average delay; and/or spatial Receiving (Rx) parameters.

Channels that use beamforming require beam management. Beam management may comprise beam measurement, beam selection, and beam indication. A beam may be associated with one or more reference signals. For example, a beam may be identified by one or more beamformed reference signals. The UE may perform downlink beam measurement based on downlink reference signals (e.g., a channel state information reference signal (CSI-RS)) and generate a beam measurement report. The UE may perform the downlink beam measurement procedure after an RRC connection is set up with a base station.

FIG. 11B illustrates an example of channel state information reference signals (CSI-RSs) that are mapped in the time and frequency domains. A square shown in FIG. 11B may span a resource block (RB) within a bandwidth of a cell. A base station may transmit one or more RRC messages comprising CSI-RS resource configuration parameters indicating one or more CSI-RSs. One or more of the following parameters may be configured by higher layer signaling (e.g., RRC and/or MAC signaling) for a CSI-RS resource configuration: a CSI-RS resource configuration identity, a number of CSI-RS ports, a CSI-RS configuration (e.g., symbol and resource element (RE) locations in a subframe), a CSI-RS subframe configuration (e.g., subframe location, offset, and periodicity in a radio frame), a CSI-RS power parameter, a CSI-RS sequence parameter, a code division multiplexing (CDM) type parameter, a frequency density, a transmission comb, quasi co-location (QCL) parameters (e.g., QCL-scramblingidentity, crs-portscount, mbsfn-subframeconfiglist, csi-rs-configZPid, qcl-csi-rs-configNZPid), and/or other radio resource parameters.

The three beams illustrated in FIG. 11B may be configured for a UE in a UE-specific configuration. Three beams are illustrated in FIG. 11B (beam #1, beam #2, and beam #3), more or fewer beams may be configured. Beam #1 may be allocated with CSI-RS 1101 that may be transmitted in one or more subcarriers in an RB of a first symbol. Beam #2 may be allocated with CSI-RS 1102 that may be transmitted in one or more subcarriers in an RB of a second symbol. Beam #3 may be allocated with CSI-RS 1103 that may be transmitted in one or more subcarriers in an RB of a third symbol. By using frequency division multiplexing (FDM), a base station may use other subcarriers in a same RB (for example, those that are not used to transmit CSI-RS 1101) to transmit another CSI-RS associated with a beam for another UE. By using time domain multiplexing (TDM), beams used for the UE may be configured such that beams for the UE use symbols from beams of other UEs.

CSI-RSs such as those illustrated in FIG. 11B (e.g., CSI-RS 1101, 1102, 1103) may be transmitted by the base station and used by the UE for one or more measurements. For example, the UE may measure a reference signal received power (RSRP) of configured CSI-RS resources. The base station may configure the UE with a reporting configuration and the UE may report the RSRP measurements to a network (for example, via one or more base stations) based on the reporting configuration. In an example, the base station may determine, based on the reported measurement results, one or more transmission configuration indication (TCI) states comprising a number of reference signals. In an example, the base station may indicate one or more TCI states to the UE (e.g., via RRC signaling, a MAC CE, and/or a DCI). The UE may receive a downlink transmission with a receive (Rx) beam determined based on the one or more TCI states. In an example, the UE may or may not have a capability of beam correspondence. If the UE has the capability of beam correspondence, the UE may determine a spatial domain filter of a transmit (Tx) beam based on a spatial domain filter of the corresponding Rx beam. If the UE does not have the capability of beam correspondence, the UE may perform an uplink beam selection procedure to determine the spatial domain filter of the Tx beam. The UE may perform the uplink beam selection procedure based on one or more sounding reference signal (SRS) resources configured to the UE by the base station. The base station may select and indicate uplink beams for the UE based on measurements of the one or more SRS resources transmitted by the UE.

In a beam management procedure, a UE may assess (e.g., measure) a channel quality of one or more beam pair links, a beam pair link comprising a transmitting beam transmitted by a base station and a receiving beam received by the UE. Based on the assessment, the UE may transmit a beam measurement report indicating one or more beam pair quality parameters comprising, e.g., one or more beam identifications (e.g., a beam index, a reference signal index, or the like), RSRP, a precoding matrix indicator (PMI), a channel quality indicator (CQI), and/or a rank indicator (RI).

FIG. 12A illustrates examples of three downlink beam management procedures: P1, P2, and P3. Procedure P1 may enable a UE measurement on transmit (Tx) beams of a transmission reception point (TRP) (or multiple TRPs), e.g., to support a selection of one or more base station Tx beams and/or UE Rx beams (shown as ovals in the top row and bottom row, respectively, of P1). Beamforming at a TRP may comprise a Tx beam sweep for a set of beams (shown, in the top rows of P1 and P2, as ovals rotated in a counter-clockwise direction indicated by the dashed arrow). Beamforming at a UE may comprise an Rx beam sweep for a set of beams (shown, in the bottom rows of P1 and P3, as ovals rotated in a clockwise direction indicated by the dashed arrow). Procedure P2 may be used to enable a UE measurement on Tx beams of a TRP (shown, in the top row of P2, as ovals rotated in a counter-clockwise direction indicated by the dashed arrow). The UE and/or the base station may perform procedure P2 using a smaller set of beams than is used in procedure P1, or using narrower beams than the beams used in procedure P1. This may be referred to as beam refinement. The UE may perform procedure P3 for Rx beam determination by using the same Tx beam at the base station and sweeping an Rx beam at the UE.

FIG. 12B illustrates examples of three uplink beam management procedures: U1, U2, and U3. Procedure U1 may be used to enable a base station to perform a measurement on Tx beams of a UE, e.g., to support a selection of one or more UE Tx beams and/or base station Rx beams (shown as ovals in the top row and bottom row, respectively, of U1). Beamforming at the UE may include, e.g., a Tx beam sweep from a set of beams (shown in the bottom rows of U1 and U3 as ovals rotated in a clockwise direction indicated by the dashed arrow). Beamforming at the base station may include, e.g., an Rx beam sweep from a set of beams (shown, in the top rows of U1 and U2, as ovals rotated in a counter-clockwise direction indicated by the dashed arrow). Procedure U2 may be used to enable the base station to adjust its Rx beam when the UE uses a fixed Tx beam. The UE and/or the base station may perform procedure U2 using a smaller set of beams than is used in procedure P1, or using narrower beams than the beams used in procedure P1. This may be referred to as beam refinement The UE may perform procedure U3 to adjust its Tx beam when the base station uses a fixed Rx beam.

A UE may initiate a beam failure recovery (BFR) procedure based on detecting a beam failure. The UE may transmit a BFR request (e.g., a preamble, a UCI, an SR, a MAC CE, and/or the like) based on the initiating of the BFR procedure. The UE may detect the beam failure based on a determination that a quality of beam pair link(s) of an associated control channel is unsatisfactory (e.g., having an error rate higher than an error rate threshold, a received signal power lower than a received signal power threshold, an expiration of a timer, and/or the like).

The UE may measure a quality of a beam pair link using one or more reference signals (RSs) comprising one or more SS/PBCH blocks, one or more CSI-RS resources, and/or one or more demodulation reference signals (DMRSs). A quality of the beam pair link may be based on one or more of a block error rate (BLER), an RSRP value, a signal to interference plus noise ratio (SINR) value, a reference signal received quality (RSRQ) value, and/or a CSI value measured on RS resources. The base station may indicate that an RS resource is quasi co-located (QCLed) with one or more DM-RSs of a channel (e.g., a control channel, a shared data channel, and/or the like). The RS resource and the one or more DMRSs of the channel may be QCLed when the channel characteristics (e.g., Doppler shift, Doppler spread, average delay, delay spread, spatial Rx parameter, fading, and/or the like) from a transmission via the RS resource to the UE are similar or the same as the channel characteristics from a transmission via the channel to the UE.

A network (e.g., a gNB and/or an ng-eNB of a network) and/or the UE may initiate a random access procedure. A UE in an RRC_IDLE state and/or an RRC_INACTIVE state may initiate the random access procedure to request a connection setup to a network. The UE may initiate the random access procedure from an RRC_CONNECTED state. The UE may initiate the random access procedure to request uplink resources (e.g., for uplink transmission of an SR when there is no PUCCH resource available) and/or acquire uplink timing (e.g., when uplink synchronization status is non-synchronized). The UE may initiate the random access procedure to request one or more system information blocks (SIBs) (e.g., other system information such as SIB2, SIB3, and/or the like). The UE may initiate the random access procedure for a beam failure recovery request. A network may initiate a random access procedure for a handover and/or for establishing time alignment for an SCell addition.

FIG. 13A illustrates a four-step contention-based random access procedure. Prior to initiation of the procedure, a base station may transmit a configuration message 1310 to the UE. The procedure illustrated in FIG. 13A comprises transmission of four messages: a Msg 1 1311, a Msg 2 1312, a Msg 3 1313, and a Msg 4 1314. The Msg 1 1311 may include and/or be referred to as a preamble (or a random access preamble). The Msg 2 1312 may include and/or be referred to as a random access response (RAR).

The configuration message 1310 may be transmitted, for example, using one or more RRC messages. The one or more RRC messages may indicate one or more random access channel (RACH) parameters to the UE. The one or more RACH parameters may comprise at least one of following: general parameters for one or more random access procedures (e.g., RACH-configGeneral); cell-specific parameters (e.g., RACH-ConfigCommon); and/or dedicated parameters (e.g., RACH-configDedicated). The base station may broadcast or multicast the one or more RRC messages to one or more UEs. The one or more RRC messages may be UE-specific (e.g., dedicated RRC messages transmitted to a UE in an RRC_CONNECTED state and/or in an RRC_INACTIVE state). The UE may determine, based on the one or more RACH parameters, a time-frequency resource and/or an uplink transmit power for transmission of the Msg 1 1311 and/or the Msg 3 1313. Based on the one or more RACH parameters, the UE may determine a reception timing and a downlink channel for receiving the Msg 2 1312 and the Msg 4 1314.

The one or more RACH parameters provided in the configuration message 1310 may indicate one or more Physical RACH (PRACH) occasions available for transmission of the Msg 1 1311. The one or more PRACH occasions may be predefined. The one or more RACH parameters may indicate one or more available sets of one or more PRACH occasions (e.g., prach-ConfigIndex). The one or more RACH parameters may indicate an association between (a) one or more PRACH occasions and (b) one or more reference signals. The one or more RACH parameters may indicate an association between (a) one or more preambles and (b) one or more reference signals. The one or more reference signals may be SS/PBCH blocks and/or CSI-RSs. For example, the one or more RACH parameters may indicate a number of SS/PBCH blocks mapped to a PRACH occasion and/or a number of preambles mapped to a SS/PBCH blocks.

The one or more RACH parameters provided in the configuration message 1310 may be used to determine an uplink transmit power of Msg 1 1311 and/or Msg 3 1313. For example, the one or more RACH parameters may indicate a reference power for a preamble transmission (e.g., a received target power and/or an initial power of the preamble transmission). There may be one or more power offsets indicated by the one or more RACH parameters. For example, the one or more RACH parameters may indicate: a power ramping step; a power offset between SSB and CSI-RS; a power offset between transmissions of the Msg 1 1311 and the Msg 3 1313; and/or a power offset value between preamble groups. The one or more RACH parameters may indicate one or more thresholds based on which the UE may determine at least one reference signal (e.g., an SSB and/or CSI-RS) and/or an uplink carrier (e.g., a normal uplink (NUL) carrier and/or a supplemental uplink (SUL) carrier).

The Msg 1 1311 may include one or more preamble transmissions (e.g., a preamble transmission and one or more preamble retransmissions). An RRC message may be used to configure one or more preamble groups (e.g., group A and/or group B). A preamble group may comprise one or more preambles. The UE may determine the preamble group based on a pathloss measurement and/or a size of the Msg 3 1313. The UE may measure an RSRP of one or more reference signals (e.g., SSBs and/or CSI-RSs) and determine at least one reference signal having an RSRP above an RSRP threshold (e.g., rsrp-ThresholdSSB and/or rsrp-ThresholdCSI-RS). The UE may select at least one preamble associated with the one or more reference signals and/or a selected preamble group, for example, if the association between the one or more preambles and the at least one reference signal is configured by an RRC message.

The UE may determine the preamble based on the one or more RACH parameters provided in the configuration message 1310. For example, the UE may determine the preamble based on a pathloss measurement, an RSRP measurement, and/or a size of the Msg 3 1313. As another example, the one or more RACH parameters may indicate: a preamble format; a maximum number of preamble transmissions; and/or one or more thresholds for determining one or more preamble groups (e.g., group A and group B). A base station may use the one or more RACH parameters to configure the UE with an association between one or more preambles and one or more reference signals (e.g., SSBs and/or CSI-RSs). If the association is configured, the UE may determine the preamble to include in Msg 1 1311 based on the association. The Msg 1 1311 may be transmitted to the base station via one or more PRACH occasions. The UE may use one or more reference signals (e.g., SSBs and/or CSI-RSs) for selection of the preamble and for determining of the PRACH occasion. One or more RACH parameters (e.g., ra-ssb-OccasionMskIndex and/or ra-OccasionList) may indicate an association between the PRACH occasions and the one or more reference signals.

The UE may perform a preamble retransmission if no response is received following a preamble transmission. The UE may increase an uplink transmit power for the preamble retransmission. The UE may select an initial preamble transmit power based on a pathloss measurement and/or a target received preamble power configured by the network. The UE may determine to retransmit a preamble and may ramp up the uplink transmit power. The UE may receive one or more RACH parameters (e.g., PREAMBLE_POWER_RAMPING_STEP) indicating a ramping step for the preamble retransmission. The ramping step may be an amount of incremental increase in uplink transmit power for a retransmission. The UE may ramp up the uplink transmit power if the UE determines a reference signal (e.g., SSB and/or CSI-RS) that is the same as a previous preamble transmission. The UE may count a number of preamble transmissions and/or retransmissions (e.g., PREAMBLE_TRANSMISSION_COUNTER). The UE may determine that a random access procedure completed unsuccessfully, for example, if the number of preamble transmissions exceeds a threshold configured by the one or more RACH parameters (e.g., preambleTransMax).

The Msg 2 1312 received by the UE may include an RAR. In some scenarios, the Msg 2 1312 may include multiple RARs corresponding to multiple UEs. The Msg 2 1312 may be received after or in response to the transmitting of the Msg 1 1311. The Msg 2 1312 may be scheduled on the DL-SCH and indicated on a PDCCH using a random access RNTI (RA-RNTI). The Msg 2 1312 may indicate that the Msg 1 1311 was received by the base station. The Msg 2 1312 may include a time-alignment command that may be used by the UE to adjust the UE's transmission timing, a scheduling grant for transmission of the Msg 3 1313, and/or a Temporary Cell RNTI (TC-RNTI). After transmitting a preamble, the UE may start a time window (e.g., ra-ResponseWindow) to monitor a PDCCH for the Msg 2 1312. The UE may determine when to start the time window based on a PRACH occasion that the UE uses to transmit the preamble. For example, the UE may start the time window one or more symbols after a last symbol of the preamble (e.g., at a first PDCCH occasion from an end of a preamble transmission). The one or more symbols may be determined based on a numerology. The PDCCH may be in a common search space (e.g., a Type1-PDCCH common search space) configured by an RRC message. The UE may identify the RAR based on a Radio Network Temporary Identifier (RNTI). RNTIs may be used depending on one or more events initiating the random access procedure. The UE may use random access RNTI (RA-RNTI). The RA-RNTI may be associated with PRACH occasions in which the UE transmits a preamble. For example, the UE may determine the RA-RNTI based on: an OFDM symbol index; a slot index; a frequency domain index; and/or a UL carrier indicator of the PRACH occasions. An example of RA-RNTI may be as follows:

RA-RNTI=1+s_id+14×t_id+14×80×f_id+14×80×8×ul_carrier_id

where s_id may be an index of a first OFDM symbol of the PRACH occasion (e.g., 0<s_id<14), t_id may be an index of a first slot of the PRACH occasion in a system frame (e.g., 0<t_id<80), f_id may be an index of the PRACH occasion in the frequency domain (e.g., 0<f_id<8), and ul_carrier_id may be a UL carrier used for a preamble transmission (e.g., 0 for an NUL carrier, and 1 for an SUL carrier). The UE may transmit the Msg 3 1313 in response to a successful reception of the Msg 2 1312 (e.g., using resources identified in the Msg 2 1312). The Msg 3 1313 may be used for contention resolution in, for example, the contention-based random access procedure illustrated in FIG. 13A. In some scenarios, a plurality of UEs may transmit a same preamble to a base station and the base station may provide an RAR that corresponds to a UE. Collisions may occur if the plurality of UEs interpret the RAR as corresponding to themselves. Contention resolution (e.g., using the Msg 3 1313 and the Msg 4 1314) may be used to increase the likelihood that the UE does not incorrectly use an identity of another the UE. To perform contention resolution, the UE may include a device identifier in the Msg 3 1313 (e.g., a C-RNTI if assigned, a TC RNTI included in the Msg 2 1312, and/or any other suitable identifier).

The Msg 4 1314 may be received after or in response to the transmitting of the Msg 3 1313. If a C-RNTI was included in the Msg 3 1313, the base station will address the UE on the PDCCH using the C-RNTI. If the UE's unique C-RNTI is detected on the PDCCH, the random access procedure is determined to be successfully completed. If a TC-RNTI is included in the Msg 3 1313 (e.g., if the UE is in an RRC_IDLE state or not otherwise connected to the base station), Msg 4 1314 will be received using a DL-SCH associated with the TC-RNTI. If a MAC PDU is successfully decoded and a MAC PDU comprises the UE contention resolution identity MAC CE that matches or otherwise corresponds with the CCCH SDU sent (e.g., transmitted) in Msg 3 1313, the UE may determine that the contention resolution is successful and/or the UE may determine that the random access procedure is successfully completed.

The UE may be configured with a supplementary uplink (SUL) carrier and a normal uplink (NUL) carrier. An initial access (e.g., random access procedure) may be supported in an uplink carrier. For example, a base station may configure the UE with two separate RACH configurations: one for an SUL carrier and the other for an NUL carrier. For random access in a cell configured with an SUL carrier, the network may indicate which carrier to use (NUL or SUL). The UE may determine the SUL carrier, for example, if a measured quality of one or more reference signals is lower than a broadcast threshold. Uplink transmissions of the random access procedure (e.g., the Msg 1 1311 and/or the Msg 3 1313) may remain on the selected carrier. The UE may switch an uplink carrier during the random access procedure (e.g., between the Msg 1 1311 and the Msg 3 1313) in one or more cases. For example, the UE may determine and/or switch an uplink carrier for the Msg 1 1311 and/or the Msg 3 1313 based on a channel clear assessment (e.g., a listen-before-talk).

FIG. 13B illustrates a two-step contention-free random access procedure. Similar to the four-step contention-based random access procedure illustrated in FIG. 13A, a base station may, prior to initiation of the procedure, transmit a configuration message 1320 to the UE. The configuration message 1320 may be analogous in some respects to the configuration message 1310. The procedure illustrated in FIG. 13B comprises transmission of two messages: a Msg 1 1321 and a Msg 2 1322. The Msg 1 1321 and the Msg 2 1322 may be analogous in some respects to the Msg 1 1311 and a Msg 2 1312 illustrated in FIG. 13A, respectively. As will be understood from FIGS. 13A and 13B, the contention-free random access procedure may not include messages analogous to the Msg 3 1313 and/or the Msg 4 1314.

The contention-free random access procedure illustrated in FIG. 13B may be initiated for a beam failure recovery, other SI request, SCell addition, and/or handover. For example, a base station may indicate or assign to the UE the preamble to be used for the Msg 1 1321. The UE may receive, from the base station via PDCCH and/or RRC, an indication of a preamble (e.g., ra-PreambleIndex).

After transmitting a preamble, the UE may start a time window (e.g., ra-ResponseWindow) to monitor a PDCCH for the RAR. In the event of a beam failure recovery request, the base station may configure the UE with a separate time window and/or a separate PDCCH in a search space indicated by an RRC message (e.g., recoverySearchSpaceId). The UE may monitor for a PDCCH transmission addressed to a Cell RNTI (C-RNTI) on the search space. In the contention-free random access procedure illustrated in FIG. 13B, the UE may determine that a random access procedure successfully completes after or in response to transmission of Msg 1 1321 and reception of a corresponding Msg 2 1322. The UE may determine that a random access procedure successfully completes, for example, if a PDCCH transmission is addressed to a C-RNTI. The UE may determine that a random access procedure successfully completes, for example, if the UE receives an RAR comprising a preamble identifier corresponding to a preamble transmitted by the UE and/or the RAR comprises a MAC sub-PDU with the preamble identifier. The UE may determine the response as an indication of an acknowledgement for an SI request.

FIG. 13C illustrates another two-step random access procedure. Similar to the random access procedures illustrated in FIGS. 13A and 13B, a base station may, prior to initiation of the procedure, transmit a configuration message 1330 to the UE. The configuration message 1330 may be analogous in some respects to the configuration message 1310 and/or the configuration message 1320. The procedure illustrated in FIG. 13C comprises transmission of two messages: a Msg A 1331 and a Msg B 1332.

Msg A 1331 may be transmitted in an uplink transmission by the UE. Msg A 1331 may comprise one or more transmissions of a preamble 1341 and/or one or more transmissions of a transport block 1342. The transport block 1342 may comprise contents that are similar and/or equivalent to the contents of the Msg 3 1313 illustrated in FIG. 13A. The transport block 1342 may comprise UCI (e.g., an SR, a HARQ ACK/NACK, and/or the like). The UE may receive the Msg B 1332 after or in response to transmitting the Msg A 1331. The Msg B 1332 may comprise contents that are similar and/or equivalent to the contents of the Msg 2 1312 (e.g., an RAR) illustrated in FIGS. 13A and 13B and/or the Msg 4 1314 illustrated in FIG. 13A.

The UE may initiate the two-step random access procedure in FIG. 13C for licensed spectrum and/or unlicensed spectrum. The UE may determine, based on one or more factors, whether to initiate the two-step random access procedure. The one or more factors may be: a radio access technology in use (e.g., LTE, NR, and/or the like); whether the UE has valid TA or not; a cell size; the UE's RRC state; a type of spectrum (e.g., licensed vs. unlicensed); and/or any other suitable factors.

The UE may determine, based on two-step RACH parameters included in the configuration message 1330, a radio resource and/or an uplink transmit power for the preamble 1341 and/or the transport block 1342 included in the Msg A 1331. The RACH parameters may indicate a modulation and coding schemes (MCS), a time-frequency resource, and/or a power control for the preamble 1341 and/or the transport block 1342. A time-frequency resource for transmission of the preamble 1341 (e.g., a PRACH) and a time-frequency resource for transmission of the transport block 1342 (e.g., a PUSCH) may be multiplexed using FDM, TDM, and/or CDM. The RACH parameters may enable the UE to determine a reception timing and a downlink channel for monitoring for and/or receiving Msg B 1332.

The transport block 1342 may comprise data (e.g., delay-sensitive data), an identifier of the UE, security information, and/or device information (e.g., an International Mobile Subscriber Identity (IMSI)). The base station may transmit the Msg B 1332 as a response to the Msg A 1331. The Msg B 1332 may comprise at least one of following: a preamble identifier; a timing advance command; a power control command; an uplink grant (e.g., a radio resource assignment and/or an MCS); a UE identifier for contention resolution; and/or an RNTI (e.g., a C-RNTI or a TC-RNTI). The UE may determine that the two-step random access procedure is successfully completed if: a preamble identifier in the Msg B 1332 is matched to a preamble transmitted by the UE; and/or the identifier of the UE in Msg B 1332 is matched to the identifier of the UE in the Msg A 1331 (e.g., the transport block 1342).

A UE and a base station may exchange control signaling. The control signaling may be referred to as L1/L2 control signaling and may originate from the PHY layer (e.g., layer 1) and/or the MAC layer (e.g., layer 2). The control signaling may comprise downlink control signaling transmitted from the base station to the UE and/or uplink control signaling transmitted from the UE to the base station.

The downlink control signaling may comprise: a downlink scheduling assignment; an uplink scheduling grant indicating uplink radio resources and/or a transport format; a slot format information; a preemption indication; a power control command; and/or any other suitable signaling. The UE may receive the downlink control signaling in a payload transmitted by the base station on a physical downlink control channel (PDCCH). The payload transmitted on the PDCCH may be referred to as downlink control information (DCI). In some scenarios, the PDCCH may be a group common PDCCH (GC-PDCCH) that is common to a group of UEs.

A base station may attach one or more cyclic redundancy check (CRC) parity bits to a DCI in order to facilitate detection of transmission errors. When the DCI is intended for a UE (or a group of the UEs), the base station may scramble the CRC parity bits with an identifier of the UE (or an identifier of the group of the UEs). Scrambling the CRC parity bits with the identifier may comprise Modulo-2 addition (or an exclusive OR operation) of the identifier value and the CRC parity bits. The identifier may comprise a 16-bit value of a radio network temporary identifier (RNTI).

DCIs may be used for different purposes. A purpose may be indicated by the type of RNTI used to scramble the CRC parity bits. For example, a DCI having CRC parity bits scrambled with a paging RNTI (P-RNTI) may indicate paging information and/or a system information change notification. The P-RNTI may be predefined as “FFFE” in hexadecimal. A DCI having CRC parity bits scrambled with a system information RNTI (SI-RNTI) may indicate a broadcast transmission of the system information. The SI-RNTI may be predefined as “FFFF” in hexadecimal. A DCI having CRC parity bits scrambled with a random access RNTI (RA-RNTI) may indicate a random access response (RAR). A DCI having CRC parity bits scrambled with a cell RNTI (C-RNTI) may indicate a dynamically scheduled unicast transmission and/or a triggering of PDCCH-ordered random access. A DCI having CRC parity bits scrambled with a temporary cell RNTI (TC-RNTI) may indicate a contention resolution (e.g., a Msg 3 analogous to the Msg 3 1313 illustrated in FIG. 13A). Other RNTIs configured to the UE by a base station may comprise a Configured Scheduling RNTI (CS-RNTI), a Transmit Power Control-PUCCH RNTI (TPC-PUCCH-RNTI), a Transmit Power Control-PUSCH RNTI (TPC-PUSCH-RNTI), a Transmit Power Control-SRS RNTI (TPC-SRS-RNTI), an Interruption RNTI (INT-RNTI), a Slot Format Indication RNTI (SFI-RNTI), a Semi-Persistent CSI RNTI (SP-CSI-RNTI), a Modulation and Coding Scheme Cell RNTI (MCS-C-RNTI), and/or the like.

Depending on the purpose and/or content of a DCI, the base station may transmit the DCIs with one or more DCI formats. For example, DCI format 0_0 may be used for scheduling of PUSCH in a cell. DCI format 0_0 may be a fallback DCI format (e.g., with compact DCI payloads). DCI format 0_1 may be used for scheduling of PUSCH in a cell (e.g., with more DCI payloads than DCI format 0_0). DCI format 1_0 may be used for scheduling of PDSCH in a cell. DCI format 1_0 may be a fallback DCI format (e.g., with compact DCI payloads). DCI format 1_1 may be used for scheduling of PDSCH in a cell (e.g., with more DCI payloads than DCI format 1_0). DCI format 2_0 may be used for providing a slot format indication to a group of UEs. DCI format 2_1 may be used for notifying a group of UEs of a physical resource block and/or OFDM symbol where the UE may assume no transmission is intended to the UE. DCI format 2_2 may be used for transmission of a transmit power control (TPC) command for PUCCH or PUSCH. DCI format 2_3 may be used for transmission of a group of TPC commands for SRS transmissions by one or more UEs. DCI format(s) for new functions may be defined in future releases. DCI formats may have different DCI sizes, or may share the same DCI size.

After scrambling a DCI with a RNTI, the base station may process the DCI with channel coding (e.g., polar coding), rate matching, scrambling and/or QPSK modulation. A base station may map the coded and modulated DCI on resource elements used and/or configured for a PDCCH. Based on a payload size of the DCI and/or a coverage of the base station, the base station may transmit the DCI via a PDCCH occupying a number of contiguous control channel elements (CCEs). The number of the contiguous CCEs (referred to as aggregation level) may be 1, 2, 4, 8, 16, and/or any other suitable number. A CCE may comprise a number (e.g., 6) of resource-element groups (REGs). A REG may comprise a resource block in an OFDM symbol. The mapping of the coded and modulated DCI on the resource elements may be based on mapping of CCEs and REGs (e.g., CCE-to-REG mapping).

FIG. 14A illustrates an example of CORESET configurations for a bandwidth part. The base station may transmit a DCI via a PDCCH on one or more control resource sets (CORESETs). A CORESET may comprise a time-frequency resource in which the UE tries to decode a DCI using one or more search spaces. The base station may configure a CORESET in the time-frequency domain. In the example of FIG. 14A, a first CORESET 1401 and a second CORESET 1402 occur at the first symbol in a slot. The first CORESET 1401 overlaps with the second CORESET 1402 in the frequency domain. A third CORESET 1403 occurs at a third symbol in the slot. A fourth CORESET 1404 occurs at the seventh symbol in the slot. CORESETs may have a different number of resource blocks in frequency domain.

FIG. 14B illustrates an example of a CCE-to-REG mapping for DCI transmission on a CORESET and PDCCH processing. The CCE-to-REG mapping may be an interleaved mapping (e.g., for the purpose of providing frequency diversity) or a non-interleaved mapping (e.g., for the purposes of facilitating interference coordination and/or frequency-selective transmission of control channels). The base station may perform different or same CCE-to-REG mapping on different CORESETs. A CORESET may be associated with a CCE-to-REG mapping by RRC configuration. A CORESET may be configured with an antenna port quasi co-location (QCL) parameter. The antenna port QCL parameter may indicate QCL information of a demodulation reference signal (DMRS) for PDCCH reception in the CORESET.

The base station may transmit, to the UE, RRC messages comprising configuration parameters of one or more CORESETs and one or more search space sets. The configuration parameters may indicate an association between a search space set and a CORESET. A search space set may comprise a set of PDCCH candidates formed by CCEs at a given aggregation level. The configuration parameters may indicate: a number of PDCCH candidates to be monitored per aggregation level; a PDCCH monitoring periodicity and a PDCCH monitoring pattern; one or more DCI formats to be monitored by the UE; and/or whether a search space set is a common search space set or a UE-specific search space set. A set of CCEs in the common search space set may be predefined and known to the UE. A set of CCEs in the UE-specific search space set may be configured based on the UE's identity (e.g., C-RNTI).

As shown in FIG. 14B, the UE may determine a time-frequency resource for a CORESET based on RRC messages. The UE may determine a CCE-to-REG mapping (e.g., interleaved or non-interleaved, and/or mapping parameters) for the CORESET based on configuration parameters of the CORESET. The UE may determine a number (e.g., at most 10) of search space sets configured on the CORESET based on the RRC messages. The UE may monitor a set of PDCCH candidates according to configuration parameters of a search space set. The UE may monitor a set of PDCCH candidates in one or more CORESETs for detecting one or more DCIs. Monitoring may comprise decoding one or more PDCCH candidates of the set of the PDCCH candidates according to the monitored DCI formats. Monitoring may comprise decoding a DCI content of one or more PDCCH candidates with possible (or configured) PDCCH locations, possible (or configured) PDCCH formats (e.g., number of CCEs, number of PDCCH candidates in common search spaces, and/or number of PDCCH candidates in the UE-specific search spaces) and possible (or configured) DCI formats. The decoding may be referred to as blind decoding. The UE may determine a DCI as valid for the UE, in response to CRC checking (e.g., scrambled bits for CRC parity bits of the DCI matching a RNTI value). The UE may process information contained in the DCI (e.g., a scheduling assignment, an uplink grant, power control, a slot format indication, a downlink preemption, and/or the like).

The UE may transmit uplink control signaling (e.g., uplink control information (UCI)) to a base station. The uplink control signaling may comprise hybrid automatic repeat request (HARQ) acknowledgements for received DL-SCH transport blocks. The UE may transmit the HARQ acknowledgements after receiving a DL-SCH transport block. Uplink control signaling may comprise channel state information (CSI) indicating channel quality of a physical downlink channel. The UE may transmit the CSI to the base station. The base station, based on the received CSI, may determine transmission format parameters (e.g., comprising multi-antenna and beamforming schemes) for a downlink transmission. Uplink control signaling may comprise scheduling requests (SR). The UE may transmit an SR indicating that uplink data is available for transmission to the base station. The UE may transmit a UCI (e.g., HARQ acknowledgements (HARQ-ACK), CSI report, SR, and the like) via a physical uplink control channel (PUCCH) or a physical uplink shared channel (PUSCH). The UE may transmit the uplink control signaling via a PUCCH using one of several PUCCH formats.

There may be five PUCCH formats and the UE may determine a PUCCH format based on a size of the UCI (e.g., a number of uplink symbols of UCI transmission and a number of UCI bits). PUCCH format 0 may have a length of one or two OFDM symbols and may include two or fewer bits. The UE may transmit UCI in a PUCCH resource using PUCCH format 0 if the transmission is over one or two symbols and the number of HARQ-ACK information bits with positive or negative SR (HARQ-ACK/SR bits) is one or two. PUCCH format 1 may occupy a number between four and fourteen OFDM symbols and may include two or fewer bits. The UE may use PUCCH format 1 if the transmission is four or more symbols and the number of HARQ-ACK/SR bits is one or two. PUCCH format 2 may occupy one or two OFDM symbols and may include more than two bits. The UE may use PUCCH format 2 if the transmission is over one or two symbols and the number of UCI bits is two or more. PUCCH format 3 may occupy a number between four and fourteen OFDM symbols and may include more than two bits. The UE may use PUCCH format 3 if the transmission is four or more symbols, the number of UCI bits is two or more and PUCCH resource does not include an orthogonal cover code. PUCCH format 4 may occupy a number between four and fourteen OFDM symbols and may include more than two bits. The UE may use PUCCH format 4 if the transmission is four or more symbols, the number of UCI bits is two or more and the PUCCH resource includes an orthogonal cover code.

The base station may transmit configuration parameters to the UE for a plurality of PUCCH resource sets using, for example, an RRC message. The plurality of PUCCH resource sets (e.g., up to four sets) may be configured on an uplink BWP of a cell. A PUCCH resource set may be configured with a PUCCH resource set index, a plurality of PUCCH resources with a PUCCH resource being identified by a PUCCH resource identifier (e.g., pucch-Resourceid), and/or a number (e.g. a maximum number) of UCI information bits the UE may transmit using one of the plurality of PUCCH resources in the PUCCH resource set. When configured with a plurality of PUCCH resource sets, the UE may select one of the plurality of PUCCH resource sets based on a total bit length of the UCI information bits (e.g., HARQ-ACK, SR, and/or CSI). If the total bit length of UCI information bits is two or fewer, the UE may select a first PUCCH resource set having a PUCCH resource set index equal to “0”. If the total bit length of UCI information bits is greater than two and less than or equal to a first configured value, the UE may select a second PUCCH resource set having a PUCCH resource set index equal to “1”. If the total bit length of UCI information bits is greater than the first configured value and less than or equal to a second configured value, the UE may select a third PUCCH resource set having a PUCCH resource set index equal to “2”. If the total bit length of UCI information bits is greater than the second configured value and less than or equal to a third value (e.g., 1406), the UE may select a fourth PUCCH resource set having a PUCCH resource set index equal to “3”.

After determining a PUCCH resource set from a plurality of PUCCH resource sets, the UE may determine a PUCCH resource from the PUCCH resource set for UCI (HARQ-ACK, CSI, and/or SR) transmission. The UE may determine the PUCCH resource based on a PUCCH resource indicator in a DCI (e.g., with a DCI format 1_0 or DCI for 1_1) received on a PDCCH. A three-bit PUCCH resource indicator in the DCI may indicate one of eight PUCCH resources in the PUCCH resource set. Based on the PUCCH resource indicator, the UE may transmit the UCI (HARQ-ACK, CSI and/or SR) using a PUCCH resource indicated by the PUCCH resource indicator in the DCI.

FIG. 15 illustrates an example of a wireless device 1502 in communication with a base station 1504 in accordance with embodiments of the present disclosure. The wireless device 1502 and base station 1504 may be part of a mobile communication network, such as the mobile communication network 100 illustrated in FIG. 1A, the mobile communication network 150 illustrated in FIG. 1B, or any other communication network. Only one wireless device 1502 and one base station 1504 are illustrated in FIG. 15 , but it will be understood that a mobile communication network may include more than one UE and/or more than one base station, with the same or similar configuration as those shown in FIG. 15 .

The base station 1504 may connect the wireless device 1502 to a core network (not shown) through radio communications over the air interface (or radio interface) 1506. The communication direction from the base station 1504 to the wireless device 1502 over the air interface 1506 is known as the downlink, and the communication direction from the wireless device 1502 to the base station 1504 over the air interface is known as the uplink. Downlink transmissions may be separated from uplink transmissions using FDD, TDD, and/or some combination of the two duplexing techniques.

In the downlink, data to be sent to the wireless device 1502 from the base station 1504 may be provided to the processing system 1508 of the base station 1504. The data may be provided to the processing system 1508 by, for example, a core network. In the uplink, data to be sent to the base station 1504 from the wireless device 1502 may be provided to the processing system 1518 of the wireless device 1502. The processing system 1508 and the processing system 1518 may implement layer 3 and layer 2 OSI functionality to process the data for transmission. Layer 2 may include an SDAP layer, a PDCP layer, an RLC layer, and a MAC layer, for example, with respect to FIG. 2A, FIG. 2B, FIG. 3 , and FIG. 4A. Layer 3 may include an RRC layer as with respect to FIG. 2B.

After being processed by processing system 1508, the data to be sent to the wireless device 1502 may be provided to a transmission processing system 1510 of base station 1504. Similarly, after being processed by the processing system 1518, the data to be sent to base station 1504 may be provided to a transmission processing system 1520 of the wireless device 1502. The transmission processing system 1510 and the transmission processing system 1520 may implement layer 1 OSI functionality. Layer 1 may include a PHY layer with respect to FIG. 2A, FIG. 2B, FIG. 3 , and FIG. 4A. For transmit processing, the PHY layer may perform, for example, forward error correction coding of transport channels, interleaving, rate matching, mapping of transport channels to physical channels, modulation of physical channel, multiple-input multiple-output (MIMO) or multi-antenna processing, and/or the like.

At the base station 1504, a reception processing system 1512 may receive the uplink transmission from the wireless device 1502. At the wireless device 1502, a reception processing system 1522 may receive the downlink transmission from base station 1504. The reception processing system 1512 and the reception processing system 1522 may implement layer 1 OSI functionality. Layer 1 may include a PHY layer with respect to FIG. 2A, FIG. 2B, FIG. 3 , and FIG. 4A. For receive processing, the PHY layer may perform, for example, error detection, forward error correction decoding, deinterleaving, demapping of transport channels to physical channels, demodulation of physical channels, MIMO or multi-antenna processing, and/or the like.

As shown in FIG. 15 , a wireless device 1502 and the base station 1504 may include multiple antennas. The multiple antennas may be used to perform one or more MIMO or multi-antenna techniques, such as spatial multiplexing (e.g., single-user MIMO or multi-user MIMO), transmit/receive diversity, and/or beamforming. In other examples, the wireless device 1502 and/or the base station 1504 may have a single antenna.

The processing system 1508 and the processing system 1518 may be associated with a memory 1514 and a memory 1524, respectively. Memory 1514 and memory 1524 (e.g., one or more non-transitory computer readable mediums) may store computer program instructions or code that may be executed by the processing system 1508 and/or the processing system 1518 to carry out one or more of the functionalities discussed in the present application. Although not shown in FIG. 15 , the transmission processing system 1510, the transmission processing system 1520, the reception processing system 1512, and/or the reception processing system 1522 may be coupled to a memory (e.g., one or more non-transitory computer readable mediums) storing computer program instructions or code that may be executed to carry out one or more of their respective functionalities.

The processing system 1508 and/or the processing system 1518 may comprise one or more controllers and/or one or more processors. The one or more controllers and/or one or more processors may comprise, for example, a general-purpose processor, a digital signal processor (DSP), a microcontroller, an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) and/or other programmable logic device, discrete gate and/or transistor logic, discrete hardware components, an on-board unit, or any combination thereof. The processing system 1508 and/or the processing system 1518 may perform at least one of signal coding/processing, data processing, power control, input/output processing, and/or any other functionality that may enable the wireless device 1502 and the base station 1504 to operate in a wireless environment.

The processing system 1508 and/or the processing system 1518 may be connected to one or more peripherals 1516 and one or more peripherals 1526, respectively. The one or more peripherals 1516 and the one or more peripherals 1526 may include software and/or hardware that provide features and/or functionalities, for example, a speaker, a microphone, a keypad, a display, a touchpad, a power source, a satellite transceiver, a universal serial bus (USB) port, a hands-free headset, a frequency modulated (FM) radio unit, a media player, an Internet browser, an electronic control unit (e.g., for a motor vehicle), and/or one or more sensors (e.g., an accelerometer, a gyroscope, a temperature sensor, a radar sensor, a lidar sensor, an ultrasonic sensor, a light sensor, a camera, and/or the like). The processing system 1508 and/or the processing system 1518 may receive user input data from and/or provide user output data to the one or more peripherals 1516 and/or the one or more peripherals 1526. The processing system 1518 in the wireless device 1502 may receive power from a power source and/or may be configured to distribute the power to the other components in the wireless device 1502. The power source may comprise one or more sources of power, for example, a battery, a solar cell, a fuel cell, or any combination thereof. The processing system 1508 and/or the processing system 1518 may be connected to a GPS chipset 1517 and a GPS chipset 1527, respectively. The GPS chipset 1517 and the GPS chipset 1527 may be configured to provide geographic location information of the wireless device 1502 and the base station 1504, respectively.

FIG. 16A illustrates an example structure for uplink transmission. A baseband signal representing a physical uplink shared channel may perform one or more functions. The one or more functions may comprise at least one of: scrambling; modulation of scrambled bits to generate complex-valued symbols; mapping of the complex-valued modulation symbols onto one or several transmission layers; transform precoding to generate complex-valued symbols; precoding of the complex-valued symbols; mapping of precoded complex-valued symbols to resource elements; generation of complex-valued time-domain Single Carrier-Frequency Division Multiple Access (SC-FDMA) or CP-OFDM signal for an antenna port; and/or the like. In an example, when transform precoding is enabled, a SC-FDMA signal for uplink transmission may be generated. In an example, when transform precoding is not enabled, an CP-OFDM signal for uplink transmission may be generated by FIG. 16A. These functions are illustrated as examples and it is anticipated that other mechanisms may be implemented in various embodiments.

FIG. 16B illustrates an example structure for modulation and up-conversion of a baseband signal to a carrier frequency. The baseband signal may be a complex-valued SC-FDMA or CP-OFDM baseband signal for an antenna port and/or a complex-valued Physical Random Access Channel (PRACH) baseband signal. Filtering may be employed prior to transmission.

FIG. 16C illustrates an example structure for downlink transmissions. A baseband signal representing a physical downlink channel may perform one or more functions. The one or more functions may comprise: scrambling of coded bits in a codeword to be transmitted on a physical channel; modulation of scrambled bits to generate complex-valued modulation symbols; mapping of the complex-valued modulation symbols onto one or several transmission layers; precoding of the complex-valued modulation symbols on a layer for transmission on the antenna ports; mapping of complex-valued modulation symbols for an antenna port to resource elements; generation of complex-valued time-domain OFDM signal for an antenna port; and/or the like. These functions are illustrated as examples and it is anticipated that other mechanisms may be implemented in various embodiments.

FIG. 16D illustrates another example structure for modulation and up-conversion of a baseband signal to a carrier frequency. The baseband signal may be a complex-valued OFDM baseband signal for an antenna port. Filtering may be employed prior to transmission.

A wireless device may receive from a base station one or more messages (e.g. RRC messages) comprising configuration parameters of a plurality of cells (e.g. primary cell, secondary cell). The wireless device may communicate with at least one base station (e.g. two or more base stations in dual-connectivity) via the plurality of cells. The one or more messages (e.g. as a part of the configuration parameters) may comprise parameters of physical, MAC, RLC, PCDP, SDAP, RRC layers for configuring the wireless device. For example, the configuration parameters may comprise parameters for configuring physical and MAC layer channels, bearers, etc. For example, the configuration parameters may comprise parameters indicating values of timers for physical, MAC, RLC, PCDP, SDAP, RRC layers, and/or communication channels.

A timer may begin running once it is started and continue running until it is stopped or until it expires. A timer may be started if it is not running or restarted if it is running. A timer may be associated with a value (e.g. the timer may be started or restarted from a value or may be started from zero and expire once it reaches the value). The duration of a timer may not be updated until the timer is stopped or expires (e.g., due to BWP switching). A timer may be used to measure a time period/window for a process. When the specification refers to an implementation and procedure related to one or more timers, it will be understood that there are multiple ways to implement the one or more timers. For example, it will be understood that one or more of the multiple ways to implement a timer may be used to measure a time period/window for the procedure. For example, a random access response window timer may be used for measuring a window of time for receiving a random access response. In an example, instead of starting and expiry of a random access response window timer, the time difference between two time stamps may be used. When a timer is restarted, a process for measurement of time window may be restarted. Other example implementations may be provided to restart a measurement of a time window.

A base station may transmit one or more MAC PDUs to a wireless device. In an example, a MAC PDU may be a bit string that is byte aligned (e.g., aligned to a multiple of eight bits) in length. In an example, bit strings may be represented by tables in which the most significant bit is the leftmost bit of the first line of the table, and the least significant bit is the rightmost bit on the last line of the table. More generally, the bit string may be read from left to right and then in the reading order of the lines. In an example, the bit order of a parameter field within a MAC PDU is represented with the first and most significant bit in the leftmost bit and the last and least significant bit in the rightmost bit.

In an example, a MAC SDU may be a bit string that is byte aligned (e.g., aligned to a multiple of eight bits) in length. In an example, a MAC SDU may be included in a MAC PDU from the first bit onward. A MAC CE may be a bit string that is byte aligned (e.g., aligned to a multiple of eight bits) in length. A MAC subheader may be a bit string that is byte aligned (e.g., aligned to a multiple of eight bits) in length. In an example, a MAC subheader may be placed immediately in front of a corresponding MAC SDU, MAC CE, or padding. A MAC entity may ignore a value of reserved bits in a DL MAC PDU.

In an example, a MAC PDU may comprise one or more MAC subPDUs. A MAC subPDU of the one or more MAC subPDUs may comprise: a MAC subheader only (including padding); a MAC subheader and a MAC SDU; a MAC subheader and a MAC CE; a MAC subheader and padding, or a combination thereof. The MAC SDU may be of variable size. A MAC subheader may correspond to a MAC SDU, a MAC CE, or padding.

In an example, when a MAC subheader corresponds to a MAC SDU, a variable-sized MAC CE, or padding, the MAC subheader may comprise: an R field with a one bit length; an F field with a one-bit length; an LCID field with a multi-bit length; an L field with a multi-bit length, or a combination thereof.

FIG. 17A shows an example of a MAC subheader with an R field, an F field, an LCID field, and an L field. In the example MAC subheader of FIG. 17A, the LCID field may be six bits in length, and the L field may be eight bits in length. FIG. 17B shows example of a MAC subheader with an R field, a F field, an LCID field, and an L field. In the example MAC subheader shown in FIG. 17B, the LCID field may be six bits in length, and the L field may be sixteen bits in length. When a MAC subheader corresponds to a fixed sized MAC CE or padding, the MAC subheader may comprise: a R field with a two-bit length and an LCID field with a multi-bit length. FIG. 17C shows an example of a MAC subheader with an R field and an LCID field. In the example MAC subheader shown in FIG. 17C, the LCID field may be six bits in length, and the R field may be two bits in length.

FIG. 18A shows an example of a DL MAC PDU. Multiple MAC CEs, such as MAC CE 1 and 2, may be placed together. A MAC subPDU, comprising a MAC CE, may be placed before: a MAC subPDU comprising a MAC SDU, or a MAC subPDU comprising padding. FIG. 18B shows an example of a UL MAC PDU. Multiple MAC CEs, such as MAC CE 1 and 2, may be placed together. In an embodiment, a MAC subPDU comprising a MAC CE may be placed after all MAC subPDUs comprising a MAC SDU. In addition, the MAC subPDU may be placed before a MAC subPDU comprising padding.

In an example, a MAC entity of a base station may transmit one or more MAC CEs to a MAC entity of a wireless device. FIG. 19 shows an example of multiple LCIDs that may be associated with the one or more MAC CEs. The one or more MAC CEs comprise at least one of: a SP ZP CSI-RS Resource Set Activation/Deactivation MAC CE, a PUCCH spatial relation Activation/Deactivation MAC CE, a SP SRS Activation/Deactivation MAC CE, a SP CSI reporting on PUCCH Activation/Deactivation MAC CE, a TCI State Indication for UE-specific PDCCH MAC CE, a TCI State Indication for UE-specific PDSCH MAC CE, an Aperiodic CSI Trigger State Subselection MAC CE, a SP CSI-RS/CSI-IM Resource Set Activation/Deactivation MAC CE, a UE contention resolution identity MAC CE, a timing advance command MAC CE, a DRX command MAC CE, a Long DRX command MAC CE, an SCell activation/deactivation MAC CE (1 Octet), an SCell activation/deactivation MAC CE (4 Octet), and/or a duplication activation/deactivation MAC CE. In an example, a MAC CE, such as a MAC CE transmitted by a MAC entity of a base station to a MAC entity of a wireless device, may have an LCID in the MAC subheader corresponding to the MAC CE. Different MAC CE may have different LCID in the MAC subheader corresponding to the MAC CE. For example, an LCID given by 111011 in a MAC subheader may indicate that a MAC CE associated with the MAC subheader is a long DRX command MAC CE.

In an example, the MAC entity of the wireless device may transmit to the MAC entity of the base station one or more MAC CEs. FIG. 20 shows an example of the one or more MAC CEs. The one or more MAC CEs may comprise at least one of: a short buffer status report (BSR) MAC CE, a long BSR MAC CE, a C-RNTI MAC CE, a configured grant confirmation MAC CE, a single entry PHR MAC CE, a multiple entry PHR MAC CE, a short truncated BSR, and/or a long truncated BSR. In an example, a MAC CE may have an LCID in the MAC subheader corresponding to the MAC CE. Different MAC CE may have different LCID in the MAC subheader corresponding to the MAC CE. For example, an LCID given by 111011 in a MAC subheader may indicate that a MAC CE associated with the MAC subheader is a short-truncated command MAC CE.

In carrier aggregation (CA), two or more component carriers (CCs) may be aggregated. A wireless device may simultaneously receive or transmit on one or more CCs, depending on capabilities of the wireless device, using the technique of CA. In an embodiment, a wireless device may support CA for contiguous CCs and/or for non-contiguous CCs. CCs may be organized into cells. For example, CCs may be organized into one primary cell (PCell) and one or more secondary cells (SCells). When configured with CA, a wireless device may have one RRC connection with a network. During an RRC connection establishment/re-establishment/handover, a cell providing NAS mobility information may be a serving cell. During an RRC connection re-establishment/handover procedure, a cell providing a security input may be a serving cell. In an example, the serving cell may denote a PCell. In an example, a base station may transmit, to a wireless device, one or more messages comprising configuration parameters of a plurality of one or more SCells, depending on capabilities of the wireless device.

When configured with CA, a base station and/or a wireless device may employ an activation/deactivation mechanism of an SCell to improve battery or power consumption of the wireless device. When a wireless device is configured with one or more SCells, a base station may activate or deactivate at least one of the one or more SCells. Upon configuration of an SCell, the SCell may be deactivated unless an SCell state associated with the SCell is set to “activated” or “dormant”.

A wireless device may activate/deactivate an SCell in response to receiving an SCell Activation/Deactivation MAC CE. In an example, a base station may transmit, to a wireless device, one or more messages comprising an SCell timer (e.g., sCellDeactivationTimer). In an example, a wireless device may deactivate an SCell in response to an expiry of the SCell timer.

When a wireless device receives an SCell Activation/Deactivation MAC CE activating an SCell, the wireless device may activate the SCell. In response to the activating the SCell, the wireless device may perform operations comprising SRS transmissions on the SCell; CQI/PMI/RI/CRI reporting for the SCell; PDCCH monitoring on the SCell; PDCCH monitoring for the SCell; and/or PUCCH transmissions on the SCell. In response to the activating the SCell, the wireless device may start or restart a first SCell timer (e.g., sCellDeactivationTimer) associated with the SCell. The wireless device may start or restart the first SCell timer in the slot when the SCell Activation/Deactivation MAC CE activating the SCell has been received. In an example, in response to the activating the SCell, the wireless device may (re-)initialize one or more suspended configured uplink grants of a configured grant Type 1 associated with the SCell according to a stored configuration. In an example, in response to the activating the SCell, the wireless device may trigger PHR.

When a wireless device receives an SCell Activation/Deactivation MAC CE deactivating an activated SCell, the wireless device may deactivate the activated SCell. In an example, when a first SCell timer (e.g., sCellDeactivationTimer) associated with an activated SCell expires, the wireless device may deactivate the activated SCell. In response to the deactivating the activated SCell, the wireless device may stop the first SCell timer associated with the activated SCell. In an example, in response to the deactivating the activated SCell, the wireless device may clear one or more configured downlink assignments and/or one or more configured uplink grants of a configured uplink grant Type 2 associated with the activated SCell. In an example, in response to the deactivating the activated SCell, the wireless device may: suspend one or more configured uplink grants of a configured uplink grant Type 1 associated with the activated SCell; and/or flush HARQ buffers associated with the activated SCell.

When an SCell is deactivated, a wireless device may not perform operations comprising: transmitting SRS on the SCell; reporting CQI/PMI/RI/CRI for the SCell; transmitting on UL-SCH on the SCell; transmitting on RACH on the SCell; monitoring at least one first PDCCH on the SCell; monitoring at least one second PDCCH for the SCell; and/or transmitting a PUCCH on the SCell. When at least one first PDCCH on an activated SCell indicates an uplink grant or a downlink assignment, a wireless device may restart a first SCell timer (e.g., sCellDeactivationTimer) associated with the activated SCell. In an example, when at least one second PDCCH on a serving cell (e.g. a PCell or an SCell configured with PUCCH, i.e. PUCCH SCell) scheduling the activated SCell indicates an uplink grant or a downlink assignment for the activated SCell, a wireless device may restart the first SCell timer (e.g., sCellDeactivationTimer) associated with the activated SCell. In an example, when an SCell is deactivated, if there is an ongoing random access procedure on the SCell, a wireless device may abort the ongoing random access procedure on the SCell.

FIG. 21A shows an example of an SCell Activation/Deactivation MAC CE of one octet. A first MAC PDU subheader with a first LCID (e.g., ‘111010’ as shown in FIG. 19 ) may identify the SCell Activation/Deactivation MAC CE of one octet. The SCell Activation/Deactivation MAC CE of one octet may have a fixed size. The SCell Activation/Deactivation MAC CE of one octet may comprise a single octet. The single octet may comprise a first number of C-fields (e.g. seven) and a second number of R-fields (e.g., one). FIG. 21B shows an example of an SCell Activation/Deactivation MAC CE of four octets. A second MAC PDU subheader with a second LCID (e.g., ‘111001’ as shown in FIG. 19 ) may identify the SCell Activation/Deactivation MAC CE of four octets. The SCell Activation/Deactivation MAC CE of four octets may have a fixed size. The SCell Activation/Deactivation MAC CE of four octets may comprise four octets. The four octets may comprise a third number of C-fields (e.g., 31) and a fourth number of R-fields (e.g., 1).

In FIG. 21A and/or FIG. 21B, a C_(i) field may indicate an activation/deactivation status of an SCell with an SCell index i if an SCell with SCell index i is configured. In an example, when the C_(i) field is set to one, an SCell with an SCell index i may be activated. In an example, when the C_(i) field is set to zero, an SCell with an SCell index i may be deactivated. In an example, if there is no SCell configured with SCell index i, the wireless device may ignore the C_(i) field. In FIG. 21A and FIG. 21B, an R field may indicate a reserved bit. The R field may be set to zero.

A base station may configure a wireless device with uplink (UL) bandwidth parts (BWPs) and downlink (DL) BWPs to enable bandwidth adaptation (BA) on a PCell. If carrier aggregation is configured, the base station may further configure the wireless device with at least DL BWP(s) (i.e., there may be no UL BWPs in the UL) to enable BA on an SCell. For the PCell, an initial active BWP may be a first BWP used for initial access. For the SCell, a first active BWP may be a second BWP configured for the wireless device to operate on the SCell upon the SCell being activated. In paired spectrum (e.g. FDD), a base station and/or a wireless device may independently switch a DL BWP and an UL BWP. In unpaired spectrum (e.g. TDD), a base station and/or a wireless device may simultaneously switch a DL BWP and an UL BWP.

In an example, a base station and/or a wireless device may switch a BWP between configured BWPs by means of a DCI or a BWP inactivity timer. When the BWP inactivity timer is configured for a serving cell, the base station and/or the wireless device may switch an active BWP to a default BWP in response to an expiry of the BWP inactivity timer associated with the serving cell. The default BWP may be configured by the network. In an example, for FDD systems, when configured with BA, one UL BWP for each uplink carrier and one DL BWP may be active at a time in an active serving cell. In an example, for TDD systems, one DL/UL BWP pair may be active at a time in an active serving cell. Operating on the one UL BWP and the one DL BWP (or the one DL/UL pair) may improve wireless device battery consumption. BWPs other than the one active UL BWP and the one active DL BWP that the wireless device may work on may be deactivated. On deactivated BWPs, the wireless device may: not monitor PDCCH; and/or not transmit on PUCCH, PRACH, and UL-SCH.

In an example, a serving cell may be configured with at most a first number (e.g., four) of BWPs. In an example, for an activated serving cell, there may be one active BWP at any point in time. In an example, a BWP switching for a serving cell may be used to activate an inactive BWP and deactivate an active BWP at a time. In an example, the BWP switching may be controlled by a PDCCH indicating a downlink assignment or an uplink grant. In an example, the BWP switching may be controlled by a BWP inactivity timer (e.g., bwp-InactivityTimer). In an example, the BWP switching may be controlled by a MAC entity in response to initiating a Random Access procedure. Upon addition of a serving cell (e.g., an SpCell) or activation of an SCell, one BWP may be initially active without receiving a PDCCH indicating a downlink assignment or an uplink grant. The active BWP for a serving cell may be indicated by RRC and/or PDCCH. In an example, for unpaired spectrum, a DL BWP may be paired with a UL BWP, and BWP switching may be common for both UL and DL.

FIG. 22 shows an example of BWP switching on a cell (e.g., PCell or SCell). In an example, a wireless device may receive from a base station at least one RRC message comprising parameters of a cell and one or more BWPs associated with the cell. The RRC message may comprise: RRC connection reconfiguration message (e.g., RRCReconfiguration); RRC connection reestablishment message (e.g., RRCRestablishment); and/or RRC connection setup message (e.g., RRCSetup). Among the one or more BWPs, at least one BWP may be configured as the first active BWP (e.g., BWP 1), one BWP as the default BWP (e.g., BWP 0). The wireless device may receive a command (e.g., RRC message, MAC CE or DCI) to activate the cell at an n^(th) slot. The wireless device may start a cell deactivation timer (e.g., sCellDeactivationTimer), and start CSI related actions for the cell, and/or start CSI related actions for the first active BWP of the cell. The wireless device may start monitoring a PDCCH on BWP 1 in response to activating the cell.

In an example, the wireless device may start restart a BWP inactivity timer (e.g., bwp-InactivityTimer) at an m^(th) slot in response to receiving a DCI indicating DL assignment on BWP 1. The wireless device may switch back to the default BWP (e.g., BWP 0) as an active BWP when the BWP inactivity timer expires, at an s^(th) slot. The wireless device may deactivate the cell and/or stop the BWP inactivity timer when the sCellDeactivationTimer expires.

In an example, a MAC entity may apply normal operations on an active BWP for an activated serving cell configured with a BWP comprising: transmitting on UL-SCH; transmitting on RACH; monitoring a PDCCH; transmitting PUCCH; receiving DL-SCH; and/or (re-) initializing any suspended configured uplink grants of configured grant Type 1 according to a stored configuration, if any.

In an example, on an inactive BWP for each activated serving cell configured with a BWP, a MAC entity may: not transmit on UL-SCH; not transmit on RACH; not monitor a PDCCH; not transmit PUCCH; not transmit SRS, not receive DL-SCH; clear any configured downlink assignment and configured uplink grant of configured grant Type 2; and/or suspend any configured uplink grant of configured Type 1.

In an example, if a MAC entity receives a PDCCH for a BWP switching of a serving cell while a Random Access procedure associated with this serving cell is not ongoing, a wireless device may perform the BWP switching to a BWP indicated by the PDCCH. In an example, if a bandwidth part indicator field is configured in DCI format 1_1, the bandwidth part indicator field value may indicate the active DL BWP, from the configured DL BWP set, for DL receptions. In an example, if a bandwidth part indicator field is configured in DCI format 0_1, the bandwidth part indicator field value may indicate the active UL BWP, from the configured UL BWP set, for UL transmissions.

In an example, for a primary cell, a wireless device may be provided by a higher layer parameter Default-DL-BWP a default DL BWP among the configured DL BWPs. If a wireless device is not provided a default DL BWP by the higher layer parameter Default-DL-BWP, the default DL BWP is the initial active DL BWP. In an example, a wireless device may be provided by higher layer parameter bwp-InactivityTimer, a timer value for the primary cell. If configured, the wireless device may increment the timer, if running, every interval of 1 millisecond for frequency range 1 or every 0.5 milliseconds for frequency range 2 if the wireless device may not detect a DCI format 1_1 for paired spectrum operation or if the wireless device may not detect a DCI format 1_1 or DCI format 0_1 for unpaired spectrum operation during the interval.

In an example, if a wireless device is configured for a secondary cell with higher layer parameter Default-DL-BWP indicating a default DL BWP among the configured DL BWPs and the wireless device is configured with higher layer parameter bwp-InactivityTimer indicating a timer value, the wireless device procedures on the secondary cell may be same as on the primary cell using the timer value for the secondary cell and the default DL BWP for the secondary cell.

In an example, if a wireless device is configured by higher layer parameter Active-BWP-DL-SCell a first active DL BWP and by higher layer parameter Active-BWP-UL-SCell a first active UL BWP on a secondary cell or carrier, the wireless device may use the indicated DL BWP and the indicated UL BWP on the secondary cell as the respective first active DL BWP and first active UL BWP on the secondary cell or carrier.

In an example, a set of PDCCH candidates for a wireless device to monitor is defined in terms of PDCCH search space sets. A search space set comprises a CSS set or a USS set. A wireless device monitors PDCCH candidates in one or more of the following search spaces sets: a Type0-PDCCH CSS set configured by pdcch-ConfigSIB1 in MIB or by searchSpaceSIB1 in PDCCH-ConfigCommon or by searchSpaceZero in PDCCH-ConfigCommon for a DCI format with CRC scrambled by a SI-RNTI on the primary cell of the MCG, a Type0A-PDCCH CSS set configured by searchSpaceOtherSystemInformation in PDCCH-ConfigCommon for a DCI format with CRC scrambled by a SI-RNTI on the primary cell of the MCG, a Type1-PDCCH CSS set configured by ra-SearchSpace in PDCCH-ConfigCommon for a DCI format with CRC scrambled by a RA-RNTI, a MsgB-RNTI, or a TC-RNTI on the primary cell, a Type2-PDCCH CSS set configured by pagingSearchSpace in PDCCH-ConfigCommon for a DCI format with CRC scrambled by a P-RNTI on the primary cell of the MCG, a Type3-PDCCH CSS set configured by SearchSpace in PDCCH-Config with searchSpaceType=common for DCI formats with CRC scrambled by INT-RNTI, SFI-RNTI, TPC-PUSCH-RNTI, TPC-PUCCH-RNTI, TPC-SRS-RNTI, CI-RNTI, or PS-RNTI and, only for the primary cell, C-RNTI, MCS-C-RNTI, or CS-RNTI(s), and a USS set configured by SearchSpace in PDCCH-Config with searchSpaceType=ue-Specific for DCI formats with CRC scrambled by C-RNTI, MCS-C-RNTI, SP-CSI-RNTI, CS-RNTI(s), SL-RNTI, SL-CS-RNTI, or SL-L-CS-RNTI.

In an example, a wireless device determines a PDCCH monitoring occasion on an active DL BWP based on one or more PDCCH configuration parameters comprising: a PDCCH monitoring periodicity, a PDCCH monitoring offset, and a PDCCH monitoring pattern within a slot. For a search space set (SS s), the wireless device determines that a PDCCH monitoring occasion(s) exists in a slot with number n_(s,f) ^(μ) in a frame with number n_(f) if (n_(f)·N_(slot) ^(frame,μ)+n_(s,f) ^(μ)−o_(s))mod k_(s)=0. N_(slot) ^(frame,μ) is a number of slots in a frame when numerology μ is configured. o_(s) is a slot offset indicated in the PDCCH configuration parameters. k_(s) is a PDCCH monitoring periodicity indicated in the PDCCH configuration parameters. The wireless device monitors PDCCH candidates for the search space set for T_(s) consecutive slots, starting from slot n_(s,f) ^(μ), and does not monitor PDCCH candidates for search space set s for the next k_(s)−T_(s) consecutive slots. In an example, a USS at CCE aggregation level L∈{1, 2, 4, 8, 16} is defined by a set of PDCCH candidates for CCE aggregation level L.

In an example, a wireless device decides, for a search space set s associated with CORESET p, CCE indexes for aggregation level L corresponding to PDCCH candidate m_(s,n) _(CI) of the search space set in slot n_(s,f) ^(μ) for an active DL BWP of a serving cell corresponding to carrier indicator field value n_(CI) as

${{L \cdot \left\{ {\left( {Y_{p,n_{s,f}^{\mu}} + \left\lfloor \frac{m_{s,{n_{CI} \cdot N_{{CCE},p}}}}{L \cdot M_{s,\max}^{(L)}} \right\rfloor + n_{CI}} \right){mod}\left\lfloor {N_{{CCE},p}/L} \right\rfloor} \right\}} + i},$

where, Y_(p,n) _(s,f) _(μ) =0 for any CSS; Y_(p,n) _(s,f) _(μ) =(A_(p)·Y_(p,n) _(s,f) _(μ) ⁻¹) mod D for a USS, Y_(p,−1)=n_(RNTI)≠0, A_(p)=39827 for p mod 3=0, A_(p)=39829 for p mod 3=1, A_(p)=39839 for p mod 3=2, and D=65537; i=0, . . . , L−1; N_(CCE,p) is the number of CCEs, numbered from 0 to N_(CCE,p)−1, in CORESET p; n_(CI) is the carrier indicator field value if the wireless device is configured with a carrier indicator field by CrossCarrierSchedulingConfig for the serving cell on which PDCCH is monitored; otherwise, including for any CSS, n_(CI)=0; m_(s,n) _(CI) =0, . . . , M_(s,n) _(CI) ^((L))−1, where M_(s,n) _(CI) ^((L)) is the number of PDCCH candidates the wireless device is configured to monitor for aggregation level L of a search space set s for a serving cell corresponding to n_(CI); for any CSS, M_(s,max) ^((L))=M_(s,0) ^((L)); for a USS, M_(s,max) ^((L)) is the maximum of M_(s,n) _(CI) ^((L)) over all configured n_(CI) values for a CCE aggregation level L of search space set s; and the RNTI value used for n_(RNTI) is the C-RNTI.

In an example, a wireless device may monitor a set of PDCCH candidates according to configuration parameters of a search space set comprising a plurality of search spaces (SSs). The wireless device may monitor a set of PDCCH candidates in one or more CORESETs for detecting one or more DCIs. Monitoring may comprise decoding one or more PDCCH candidates of the set of the PDCCH candidates according to the monitored DCI formats. Monitoring may comprise decoding a DCI content of one or more PDCCH candidates with possible (or configured) PDCCH locations, possible (or configured) PDCCH formats (e.g., number of CCEs, number of PDCCH candidates in common SSs, and/or number of PDCCH candidates in the UE-specific SSs) and possible (or configured) DCI formats. The decoding may be referred to as blind decoding.

FIG. 23A shows an example of configuration parameters of a master information block (MIB) of a cell (e.g., PCell). In an example, a wireless device, based on receiving primary synchronization signal (PSS) and/or secondary synchronization signal (SSS), may receive a MIB via a PBCH. The configuration parameters of a MIB may comprise six bits (systemFrameNumber) of system frame number (SFN), subcarrier spacing indication (subCarrierSpacingCommon), a frequency domain offset (ssb-SubcarrierOffset) between SSB and overall resource block grid in number of subcarriers, an indication (cellBarred) indicating whether the cell is bared, a DMRS position indication (dmrs-TypeA-Position) indicating position of DMRS, parameters of CORESET and SS of a PDCCH (pdcch-ConfigSIB1) comprising a common CORESET, a common search space and necessary PDCCH parameters.

In an example, a pdcch-ConfigSIB1 may comprise a first parameter (e.g., controlResourceSetZero) indicating a common ControlResourceSet (CORESET) with ID #0 (e.g., CORESET #0) of an initial BWP of the cell. controlResourceSetZero may be an integer between 0 and 15. Each integer between 0 and 15 may identify a configuration of CORESET #0. FIG. 23B shows an example of a configuration of CORESET #0. As shown in FIG. 23B, based on a value of the integer of controlResourceSetZero, a wireless device may determine a SSB and CORESET #0 multiplexing pattern, a number of RBs for CORESET #0, a number of symbols for CORESET #0, a RB offset for CORESET #0.

In an example, a pdcch-ConfigSIB1 may comprise a second parameter (e.g., searchSpaceZero) common search space with ID #0 (e.g., SS #0) of the initial BWP of the cell. searchSpaceZero may be an integer between 0 and 15. Each integer between 0 and 15 may identify a configuration of SS #0. FIG. 23C shows an example of a configuration of SS #0. As shown in FIG. 23C, based on a value of the integer of searchSpaceZero, a wireless device may determine one or more parameters (e.g., O, M) for slot determination of PDCCH monitoring, a first symbol index for PDCCH monitoring and/or a number of search spaces per slot.

In an example, based on receiving a MIB, a wireless device may monitor PDCCH via SS #0 of CORESET #0 for receiving a DCI scheduling a system information block 1 (SIB1). The wireless device may receive the DCI with CRC scrambled with a system information radio network temporary identifier (SI-RNTI) dedicated for receiving the SIB1.

FIG. 24 shows an example of RRC configuration parameters of system information block (SIB). A SIB (e.g., SIB1) may contain information relevant when evaluating if a wireless device is allowed to access a cell and may define scheduling of other system information. A SIB may contain radio resource configuration information that is common for all wireless devices and barring information applied to a unified access control. In an example, a base station may transmit to a wireless device (or a plurality of wireless devices) one or more SIB information. As shown in FIG. 24 , parameters of the one or more SIB information may comprise: one or more parameters (e.g., cellSelectionInfo) for cell selection related to a serving cell, one or more configuration parameters of a serving cell (e.g., in ServingCellConfigCommonSIB IE), and one or more other parameters. The ServingCellConfigCommonSIB IE may comprise at least one of: common downlink parameters (e.g., in DownlinkConfigCommonSIB IE) of the serving cell, common uplink parameters (e.g., in UplinkConfigCommonSIB IE) of the serving cell, and other parameters.

In an example a DownlinkConfigCommonSIB IE may comprise parameters of an initial downlink BWP of the serving cell (e.g., SpCell). The parameters of the initial downlink BWP may be comprised in a BWP-DownlinkCommon IE (as shown in FIG. 25 ). The BWP-DownlinkCommon IE may be used to configure common parameters of a downlink BWP of the serving cell. The base station may configure the locationAndBandwidth so that the initial downlink BWP contains the entire CORESET #0 of this serving cell in the frequency domain. The wireless device may apply the locationAndBandwidth upon reception of this field (e.g. to determine the frequency position of signals described in relation to this locationAndBandwidth) but it keeps CORESET #0 until after reception of RRCSetup/RRCResume/RRCReestablishment.

In an example, an UplinkConfigCommonSIB IE may comprise parameters of an initial uplink BWP of the serving cell (e.g., SpCell). The parameters of the initial uplink BWP may be comprised in a BWP-UplinkCommon IE. The BWP-UplinkCommon IE may be used to configure common parameters of an uplink BWP. The common parameters of an uplink BWP are “cell specific”. The base station may ensure the necessary alignment with corresponding parameters of other wireless devices. The common parameters of the initial bandwidth part of the PCell may be provided via system information. For all other serving cells, the base station may provide the common parameters via dedicated signaling.

FIG. 25 shows an example of RRC configuration parameters (e.g., BWP-DownlinkCommon IE) in a of a downlink BWP of a serving cell. A base station may transmit to a wireless device (or a plurality of wireless devices) one or more configuration parameters of a downlink BWP (e.g., initial downlink BWP) of a serving cell. As shown in FIG. 25 , the one or more configuration parameters of the downlink BWP may comprise: one or more generic BWP parameters of the downlink BWP, one or more cell specific parameters for PDCCH of the downlink BWP (e.g., in pdcch-ConfigCommon IE), one or more cell specific parameters for the PDSCH of this BWP (e.g., in pdsch-ConfigCommon IE), and one or more other parameters. A pdcch-ConfigCommon IE may comprise parameters of COESET #0 (e.g., controlResourceSetZero) which can be used in any common or UE-specific search spaces. A value of the controlResourceSetZero may be interpreted like the corresponding bits in MIB pdcch-ConfigSIB1. A pdcch-ConfigCommon IE may comprise parameters (e.g., in commonControlResourceSet) of an additional common control resource set which may be configured and used for any common or UE-specific search space. If the network configures this field, it uses a ControlResourceSetId other than 0 for this ControlResourceSet. Parameters of a control resource set may be implemented as shown in FIG. 25 . The network configures the commonControlResourceSet in SIB1 so that it is contained in the bandwidth of CORESET #0. A pdcch-ConfigCommon IE may comprise parameters (e.g., in commonSearchSpaceList) of a list of additional common search spaces. Parameters of a search space may be implemented based on example of FIG. 26 . A pdcch-ConfigCommon IE may indicate, from a list of search spaces, a search space for paging (e.g., pagingSearchSpace), a search space for random access procedure (e.g., ra-SearchSpace), a search space for SIB1 message (e.g., searchSpaceSIB1), a common search space #0 (e.g., searchSpaceZero), and one or more other search spaces.

As shown in FIG. 25 , a control resource set (CORESET) may be associated with a CORESET index (e.g., ControlResourceSetId). The CORESET index with a value of 0 may identify a common CORESET configured in MIB and in ServingCellConfigCommon (controlResourceSetZero) and may not be used in the ControlResourceSet IE. The CORESET index with other values may identify CORESETs configured by dedicated signaling or in SIB1. The controlResourceSetId is unique among the BWPs of a serving cell. A CORESET may be associated with coresetPoolIndex indicating an index of a CORESET pool for the CORESET. A CORESET may be associated with a time duration parameter (e.g., duration) indicating contiguous time duration of the CORESET in number of symbols. In an example, as shown in FIG. 25 , configuration parameters of a CORESET may comprise at least one of: frequency resource indication (e.g., frequencyDomainResources), a CCE-REG mapping type indicator (e.g., cce-REG-MappingType), a plurality of TCI states, an indicator indicating whether a TCI is present in a DCI, and the like. The frequency resource indication, comprising a number of bits (e.g., 45 bits), indicates frequency domain resources, each bit of the indication corresponding to a group of 6 RBs (a resource block group, or a RBG in this specification), with grouping starting from the first RB group in a BWP of a cell (e.g., SpCell, SCell). The first (left-most/most significant) bit corresponds to the first RB group in the BWP, and so on. A bit that is set to 1 indicates that an RB group, corresponding to the bit, belongs to the frequency domain resource of this CORESET. Bits corresponding to a group of RBs not fully contained in the BWP within which the CORESET is configured are set to zero.

FIG. 26 shows an example of configuration of a search space (e.g., SearchSpace IE). In an example, one or more search space configuration parameters of a search space may comprise at least one of: a search space ID (searchSpaceId), a control resource set ID (controlResourceSetId), a monitoring slot periodicity and offset parameter (monitoringSlotPeriodicityAndOffset), a search space time duration value (duration), a monitoring symbol indication (monitoringSymbolsWithinSlot), a number of candidates for an aggregation level (nrofCandidates), and/or a SS type indicating a common SS type or a UE-specific SS type (searchSpaceType). The monitoring slot periodicity and offset parameter may indicate slots (e.g. in a radio frame) and slot offset (e.g., related to a starting of a radio frame) for PDCCH monitoring. The monitoring symbol indication may indicate on which symbol(s) of a slot a wireless device may monitor PDCCH on the SS. The control resource set ID may identify a control resource set on which a SS may be located.

In an embodiment, a base station may transmit, or a wireless device may receive, a TB scheduled in a unicast transmission, a broadcast transmission, a multicast transmission, or a combination thereof. FIG. 27A and FIG. 27B shows examples of unicast transmission, broadcast transmission and multicast transmission.

As shown in FIG. 27A, a first wireless device (e.g., WD1) may receive from a base station transport blocks (TBs) dedicated for the first wireless device, and/or scheduled by a DCI with a first UE specific RNTI (e.g., C-RNTI, CS-RNTI, MCS-C-RNTI, etc.,). In the example shown in FIG. 27A, second wireless devices (e.g., WD2, WD3, WD4 etc.) may not receive the TBs dedicated for the first wireless device because the second wireless devices are not configured with the first UE specific RNTI. In an example, TB s dedicated for a wireless device may be referred to as unicast TBs. A PDSCH carrying a TB dedicated for the wireless device may be referred to as a unicast PDSCH. A PDCCH (or a DCI) scheduling the dedicated TB may be referred to a unicast PDCCH (or a unicast DCI). In an example, transmitting a TB, to a wireless device and scheduled by a unicast DCI, may improve security and flexibility of the scheduling.

As shown in FIG. 27A, a wireless device may receive from a base station multicast TBs (or groupcast TBs), of a multicast service (e.g., MBS), which may be received by a group of wireless devices (e.g., WD2, WD3, WD4 etc.) in the coverage of the base station. To receive the multicast TBs, the group of wireless devices may be allocated/configured with a group dedicated RNTI (e.g., G-RNTI or SC-RNTI, or MBS-RNTI). Based on the configured group dedicated RNTI, the group of wireless devices may monitor PDCCH for receiving a DCI with CRC scrambled by the group dedicated RNTI, the DCI scheduling the multicast TBs. In an example, a wireless device (e.g., WD1) that is not configured with the group dedicated RNTI may not receive the multicast TBs. In an example, the MBS may carry message of applications comprising at least one of: V2X, public safety, live video (e.g., concert or sport), IOT software update, industry applications, etc. An MBS carrying a type of application data may be defined as an MBS session. Different MBS session may be used for different applications. A wireless device interested in the MBS provided by the base station may indicate to the base station that the wireless device is interested in the MBS service. The base station may accordingly transmit to the wireless device MBS configuration parameters comprising a RNTI dedicated for receiving DCI scheduling the MBS TBs. By allocating the dedicated RNTI to a wireless device for receiving the MBS, the base station may be aware of which wireless device, or how many wireless devices, subscribe to the MBS. The MBS is different from broadcast message where the base station does not know which wireless device, or how many wireless devices are receiving the broadcast message. In an example, a network operator may determine an MBS transmission strategy or price strategy based on a number of subscribers of the MBS by using the multicast/groupcast scheduling.

As shown in FIG. 27B, a wireless device may receive from a base station broadcast TBs which may be received by any wireless device in coverage of a base station. The broadcast TBs may comprise system information message, paging information message, etc. In an example, when receiving broadcasted system information, or paging information, any wireless device in the cell may monitor a PDCCH for receiving a DCI with CRC scrambled by a predefined RNTI (e.g., SI-RNTI with predefined value as “FFFF” in hexa-decimal, or P-RNTI with predefined value as “FFFE” in hexa-decimal, etc.). Since the RNTIs, for receiving the DCI scheduling the broadcasted message, are known (e.g., by being set to predefined value) to any wireless device in the cell, any wireless device may receive the broadcasted message. In an example, by transmitting a system information or paging message scheduled by a broadcast scheduling DCI to a group of wireless devices, a base station may improve signaling efficiency for the base station.

In an embodiment, a base station may transmit to a group of wireless devices, MBS TBs via a BWP of a plurality of BWPs of a cell.

FIG. 28A and FIG. 28B show examples of MBS configurations when multiple BWPs are configured in a cell.

As shown in FIG. 28A, a BWP used for the transmission of MBS TBs (e.g., which may be referred to as MBS BWP in this specification) may be configured separately and/or independently from a BWP for transmission of unicast TBs and/or broadcast TBs (e.g., which may be referred to as unicast BWP in this specification). An MBS BWP in this specification may be defined as a BWP, of a cell, on which MBS PDCCH/PDSCH may be transmitted. A unicast BWP in this specification may be defined as a BWP, of a cell, on which unicast PDCCH/PDSCH (and/or broadcast PDCCH/PDSCH) may be transmitted.

In an example, a base station may transmit to a wireless device one or more RRC messages comprising configuration parameters of a cell comprising a plurality of BWPs. The one or more RRC messages may indicate that a first set of the plurality of BWPs are dedicated as unicast BWPs (e.g., BWP n, BWP m, etc., used for unicast PDCCH/PDSCH transmission, or broadcasted system information transmission, or broadcasted paging message transmission). In an example, the one or more RRC messages may indicate that a second set of the plurality of BWPs are dedicated as MBS BWPs (e.g., BWP x, BWP y, etc., used for MBS PDCCH/PDSCH transmission). In an embodiment, different MBS (e.g., V2X, public safety, live video, IOT software update, industry applications, etc.), targeting to different groups of wireless devices, may be configured on different BWPs. An MBS BWP may be used for transmission of different MBS TBs associated with different MBS configurations (e.g., V2X, public safety, live video, IOT software update, industry applications, etc.). In an example, configuring separate BWP(s) for MBS from unicast BWP(s) may improve system throughput and reduce scheduling limitation/impact on the unicast PDSCH scheduling. In an embodiment, to support configuring separate BWP(s) for MBS, a wireless device may be required to support multiple active BWPs in a cell.

As shown in FIG. 28B, frequency resources used for the transmission of MBS TBs may be configured within a BWP for transmission of unicast TBs and/or broadcast TBs. The frequency resources configured in the BWP may be resource blocks common to a group of wireless devices configured with the MBS. The BWP may be an initial BWP of a cell, or a first active BWP configured on the cell. The BWP may be any BWP, except a dormant BWP of the cell. In an embodiment, a number of frequency resource blocks within a unicast BWP may be dedicated for transmission of MBS PDCCH/PDSCH to a group of wireless devices. In an example, the number of frequency resource blocks (or a set of frequency resource blocks) and locations of those frequency resource blocks within the BWP may be configured by the base station in the one or more RRC messages. The one or more RRC messages may further indicate configuration parameters of PDCCH for the MBS (e.g., referred to as MBS PDCCH), where the MBS PDCCH may carry a DCI with CRC scrambled by an MBS-specific RNTI (e.g., MBS-RNTI, SC-RNTI, G-RNTI, etc.). The configuration parameters may indicate frequency resource allocation and time domain allocation of a search space and/or a CORESET for reception of the MBS PDCCH) within bandwidth of the unicast BWP. In an example, frequency resource allocation and time domain allocation of a search space and/or a CORESET may be implemented based on examples of FIG. 25 and/or FIG. 26 .

In an embodiment, different MBS, targeting different groups of wireless devices, may be configured on different sets of frequency resource blocks within a unicast BWP. As shown in FIG. 28B, frequency resource blocks for an MBS may be allocated on different unicast BWPs. In an example, configuring frequency resources for MBS within unicast BWP may simplify implementation of a wireless device and reduce power consumption of a wireless device. In an example, by supporting configuring the frequency resource for MBS within the unicast BWP, a wireless device may be required to support a single active BWP in a cell.

In an example, a wireless device may receive downlink assignments, on a PDCCH (e.g., in a DCI), indicating that there is a transmission on a downlink shared channel (DL-SCH) for a MAC entity of the wireless device and provides HARQ information. The HARQ information may comprise a New Data Indicator (NDI), Transport Block size (TBS), Redundancy Version (RV), and HARQ process ID etc. A MAC entity of the wireless device may be configured with a wireless device specific identifier (e.g., C-RNTI, TC-RNTI, or CS-RNTI). The MAC entity of the wireless device may monitor PDCCH for a PDCCH occasion and for a cell.

In an embodiment, the MAC entity may determine the NDI (a bit) to have been toggled if a downlink assignment (for a PDCCH occasion and a cell) has been received on a PDCCH for the MAC entity's C-RNTI/TC-RNTI and if this is the first downlink assignment for the TC-RNTI. The MAC entity may determine the NDI to have been toggled regardless of the value of the NDI if the downlink assignment has been received on the PDCCH for the MAC entity's C-RNTI/TC-RNTI, the downlink assignment is for the MAC entity's C-RNTI, and a previous downlink assignment indicated to the HARQ entity of the same HARQ process was either a downlink assignment received for the MAC entity's CS-RNTI or a configured downlink assignment. Based on the determined NDI, the MAC entity may indicate the presence of a downlink assignment and deliver the associated HARQ information to the HARQ entity of the wireless device for the cell.

In an embodiment, if a wireless device receives, for a PDCCH occasion and for a cell, a downlink assignment on a PDCCH for the MAC entity's CS-RNTI, the MAC entity may determine a NDI for a corresponding HARQ process (based on the downlink assignment) not to have been toggled if a NDI in the received HARQ information (based on the downlink assignment) is 1. The wireless device may indicate the presence of the downlink assignment for the cell and deliver the associated HARQ information to the HARQ entity associated with the cell.

In an embodiment, if a wireless device receives, for a PDCCH occasion and for a cell, a downlink assignment on a PDCCH for the MAC entity's CS-RNTI, the MAC entity may perform SPS activation/deactivation related activations if an NDI in the received HARQ information (based on the downlink assignment) is 0.

In an embodiment, a wireless device may be configured with a configured downlink assignment on a cell. The wireless device may activate the configured downlink assignment based on the CS-RNTI of the MAC entity. Based on the configured downlink assignment being configured and activated, if a PDSCH duration of the configured downlink assignment (referred to as a semi-persistent downlink assignment, or SPS in this specification) does not overlap with a PDSCH duration of a downlink assignment received on the PDCCH (referred to as a dynamic downlink assignment in this specification) for the cell, a MAC entity of the wireless device may instruct the physical layer to receive, in the PDSCH duration, TB on the DL-SCH according to the configured downlink assignment and to deliver it to the HARQ entity associated with the cell. The MAC entity may set the HARQ Process ID to a HARQ Process ID associated with the PDSCH duration. The MAC entity may determine an NDI bit, for a corresponding HARQ process, to have been toggled. The MAC entity may indicate the presence of the configured downlink assignment and deliver the stored HARQ information to the HARQ entity.

In an embodiment, for configured downlink assignments without a high layer HARQ process ID offset value (e.g., harq-ProcID-Offset), a wireless device may derive a HARQ Process ID associated with a slot where a DL transmission starts based on the following equation: HARQ Process ID=[floor (CURRENT_slot×10/(numberOfSlotsPerFrame×periodicity))] modulo nrofHARQ-Processes. CURRENT_slot=[(SFN×numberOfSlotsPerFrame)+slot number in the frame] and numberOfSlotsPerFrame refers to the number of consecutive slots per frame. SFN may be a system frame number of the slot.

In an embodiment, for configured downlink assignments with a high layer HARQ process ID offset value (e.g., harq-ProcID-Offset), a wireless device may derive a HARQ Process ID associated with a slot where a DL transmission starts based on the following equation: HARQ Process ID=[floor (CURRENT_slot×10/(numberOfSlotsPerFrame×periodicity))] modulo nrofHARQ-Processes+harq-ProcID-Offset. CURRENT_slot=[(SFN×numberOfSlotsPerFrame)+slot number in the frame] and numberOfSlotsPerFrame refers to the number of consecutive slots per frame. SFN may be a system frame number of the slot.

When the MAC entity needs to receive BCCH, the MAC entity may, based on the scheduling information from RRC, may indicate a downlink assignment and redundancy version for the dedicated broadcast HARQ process to the HARQ entity, if a downlink assignment for the PDCCH occasion has been received on the PDCCH for the SI-RNTI.

A MAC entity of a wireless device may comprise a HARQ entity for each serving cell. The HARQ entity may maintain a number of parallel HARQ processes. The HARQ entity may direct HARQ information and associated TBs received on the DL-SCH to the corresponding HARQ processes.

A HARQ process may support one TB when the physical layer is not configured for downlink spatial multiplexing. A HARQ process may support one or two TBs when the physical layer is configured for downlink spatial multiplexing. A HARQ process may be associated with a HARQ process identifier (ID). A dedicated broadcast HARQ process is used for a broadcast logic channel (BCCH) transmission.

A MAC entity of a wireless device may allocate TB(s) received from a physical layer of the wireless device and associated HARQ information to a HARQ process indicated by the associated HARQ information (e.g., NDI, TBS, RV, and HARQ process ID) in response to a downlink assignment being indicated. The MAC entity may allocate the received TB(s) to a broadcast HARQ process in response to the downlink assignment being indicated for the broadcast HARQ process.

FIG. 29 shows an example of a HARQ entity configured with multiple HARQ processes, according to some embodiments. As shown in FIG. 29 a HARQ entity may comprise a number of parallel HARQ processes (e.g., Process #m, Process #n, etc.). Process #m may be identified with a first HARQ process identifier (e.g., m). Process #n may be identified with a second HARQ process identifier (e.g., n). In an example, when receiving downlink data from the base station, a wireless device may process TB 1 in Process #m. The wireless device may process TB 2 in Process #n. In response to TB 1 not being successfully decoded by a wireless device, the wireless device may store received data of TB1 in a soft buffer of Process #m. The wireless device may transmit a negative acknowledgement (NACK) for TB 1 to the base station. In response to the NACK, the base station may retransmit TB 1. The wireless device may attempt to decode TB 1 based on the stored data of TB 1 in the soft buffer and received data in retransmission of TB 1. In an example embodiment, in response to TB 2 being successfully decoded, the wireless device may transmit a positive acknowledgement (ACK) for TB 2 to the base station. In response to TB 2 being successfully decoded, the wireless device may deliver decoded data (e.g., MAC PDU) to a disassembly and demultiplexing entity of the wireless device. In response to the received positive acknowledgement, the base station may transmit a new transport block (e.g., TB 3) by using Process #n.

In an embodiment, when a transmission takes place for a HARQ process, a HARQ entity (e.g., of the wireless device) may deliver one or two (in case of downlink spatial multiplexing) TBs (received) and the associated HARQ information to the HARQ process.

For a received TB and associated HARQ information, a HARQ process (of the HARQ entity of the wireless device) may determine a transmission (associated with the TB) to be a new transmission if a NDI has been toggled compared to the value of the previous received transmission corresponding to the received TB, or if the HARQ process is equal to the broadcast process and this is the first received transmission for the TB according to the system information schedule indicated by RRC, or if this is the first received transmission for this TB (e.g., there is no previous NDI for the TB). Otherwise, the HARQ process may determine the transmission (associated with TB) to be a retransmission. Based on the determining the transmission to be a new transmission, the MAC entity may attempt to decode the received data. Based on the determining the transmission to be a retransmission, the MAC entity may instruct the physical layer to combine the received data with the data currently in the soft buffer for the TB and attempt to decode the combined data if the data for the TB has not yet been successfully decoded.

If the data which the MAC entity attempts to decode is successfully decoded for a TB, or if the data for the TB is successfully decoded before, the MAC entity may deliver the decoded MAC PDU to upper layers if a HARQ process is equal to the broadcast process. If the data which the MAC entity attempts to decode is successfully decoded for a TB, or if the data for the TB is successfully decoded before, the MAC entity may deliver the decoded MAC PDU to the disassembly and demultiplexing entity if this is the first successful decoding of the data for the TB.

If the data which the MAC entity attempts to decode is unsuccessfully decoded for a TB, and if the data for the TB is unsuccessfully decoded before, the MAC entity may instruct the physical layer to replace the data in the soft buffer for the TB with the data which the MAC entity attempted to decode.

The MAC entity may not instruct the physical layer to generate acknowledgement(s) of the data in the TB if the HARQ process is associated with a transmission indicated with a TC-RNTI and the Contention Resolution is not yet successful, or if the HARQ process is associated with a transmission indicated with a MSGB-RNTI and the Random Access procedure is not yet successfully completed, or if the HARQ process is equal to the broadcast process, or if a timeAlignmentTimer, associated with a TAG containing the cell on which the HARQ feedback is to be transmitted, is stopped or expired. Otherwise, the MAC entity may instruct the physical layer to generate acknowledgement(s) of the data in the TB.

A MAC entity may ignore NDI received in all downlink assignments on PDCCH for its TC-RNTI when determining if NDI on PDCCH for its C-RNTI has been toggled compared to the value in the previous transmission. If the MAC entity receives a retransmission with a TB size different from the last TB size signaled for the TB, the wireless device's behavior may be left up to the wireless device's implementation.

FIG. 30 shows an example of a downlink TB (re)transmission mechanism based on a HARQ procedure, according to some embodiments. In an example, a base station (e.g., gNB) may transmit to a wireless device (e.g., UE), a first downlink control information (DCI) comprising a downlink assignment and one or more HARQ information. The one or more HARQ information may comprise a HARQ Process ID (e.g., Process ID=k as shown in FIG. 30 ), a first NDI value (e.g., 1^(st) NDI=1), and the like. The physical layer of the wireless device may receive the data of a first TB based on the downlink assignment. The wireless device, before receiving the first DCI, may have a current NDI value (e.g., current NDI=0 as shown in FIG. 30 ).

In response to receiving the first DCI, the wireless device may determine that the first NDI has been toggled in response to the first NDI value (1) being different from the current NDI value (0). In response to the first NDI being toggled, the MAC entity of the wireless device may determine a transmission of the first TB to be a new transmission, and attempt to decode the received data of the first TB. The MAC entity may not successfully decode the received data. In response to not successfully decoding the received data, the MAC entity may instruct the physical layer to replace a soft buffer for the first TB with the data which the MAC entity attempted to decode. The MAC entity may instruct the physical layer to generate a NACK for the data in the first TB. In an example, in response to not successfully decoding the received data, the wireless device may transmit the NACK to the base station.

In response to receiving the NACK, the base station may transmit a second DCI indicating a retransmission of the first TB, wherein the second DCI comprise a same HARQ Process ID as the first HARQ Process ID, a second downlink assignment, a RV value, and a second NDI value (e.g., 2^(nd) NDI=1).

The UE may determine the second NDI is not toggled in response to the second NDI value (1) being equal to the first NDI value (1), which is now the new current NDI value. The physical layer may receive the data of the retransmitted first TB via the second downlink assignment. In response to the second NDI not being toggled, the MAC entity of the wireless device may determine the transmission via the second downlink assignment to be a retransmission of the first TB. In an example, the wireless device may attempt to decode the first TB based on the newly received data of the first TB and the current data in the soft buffer associated with the HARQ process identified by HARQ Process ID k.

In an example, the MAC entity may successfully decode the received data of the first TB. In response to successfully decoding the received data, the MAC entity may deliver a decoded data (e.g., MAC PDU) to a disassembly and demultiplexing entity of the wireless device. The MAC entity may instruct the physical layer to generate an ACK of the data in the first TB. The wireless device may transmit the ACK for the first TB to the base station.

In an example, a wireless device may receive from a base station one or more TBs of an MBS session. The MBS session may require higher QoS than a periodic broadcast message. Compared with the periodic broadcast message, an MBS session comprising V2X application data may require lower latency transmission. Compared with periodic broadcast message, an MBS session comprising IOT industry application data may require higher reliability. Compared with periodic broadcast message, an MBS session comprising live video application data may require higher throughput and higher reliability, etc.

To meet the QoS requirement of transmission of an MBS TB, a base station may apply a HARQ mechanism for retransmission of the MBS TB when a wireless device subscribed to the MBS session does not receive the MBS TB successfully. The base station may retransmit the MBS TB in a unicast transmission or in a multicast transmission.

FIG. 31A and FIG. 31B show examples of unicast retransmission of an MBS TB and multicast retransmission of an MBS TB, according to some embodiments.

As shown in FIG. 31A, a wireless device, when subscribed to an MBS session, may receive an initial transmission of an MBS TB (or a TB). The wireless device may receive the initial transmission based on receiving a DCI with CRC scrambled by an MBS-RNTI associated with the MBS session. The wireless device may receive the DCI when the wireless device is monitoring PDCCH on a search space (associated with a CORESET) configured for the MBS session. The wireless device may attempt to decode the MBS TB based on the MBS-RNTI. The wireless device may decode the TB unsuccessfully (e.g., with incorrect CRC check). The wireless device may buffer the received data for the TB based on unsuccessfully decoding the TB.

As shown in FIG. 31A, the wireless device may transmit a HARQ NACK indicating that the wireless device decoded the TB unsuccessfully. The base station may, based on the received HARQ NACK, transmit a second DCI with CRC scrambled by the MBS-RNTI. The second DCI may indicate a retransmission of the MBS TB. The second DCI is transmitted to a group of wireless devices subscribed to the MBS session. The retransmission of the MBS TB is for the group of wireless devices. The wireless device, based on the transmitting the HARQ NACK, may monitor the PDCCH on the search space configured for the MBS session for receiving the second DCI indicating the retransmission of the MBS TB. The wireless device may receive the retransmitted MBS TB based on receiving the second DCI. The wireless device may combine the first received data (e.g., the first TB initialized received based on the 1^(st) DCI) and second received data (e.g., the newly received data for the MBS TB based on the 2^(nd) DCI). The wireless device may attempt to decode the combined first and second data for the MBS TB based on the MBS-RNTI.

In an example, the wireless device may decode the combined data successfully. The wireless device may deliver decoded MAC PDU comprised in the MBS TB to a disassembly and demultiplexing entity of the wireless device.

In an example, the wireless device may decode the combined data unsuccessfully. The wireless device, based on unsuccessfully decoding the combined data, may determine to request retransmission based on examples of the above embodiments.

Retransmission of a MBS TB in a multicast transmission may improve signaling overhead, e.g., when multiple wireless devices, subscribed to an MBS session, request retransmission of the MBS TB in response to the MBS TB being unsuccessfully decoded by the multiple wireless devices. Retransmission of the MBS TB in a multicast transmission may reduce multicast transmission throughput because the base station may retransmit the MBS TB in a multicast transmission when there is a wireless device of the multiple wireless devices who does not correctly decode the MBS TB even if one or more other wireless devices of the multiple wireless devices did correctly decode the MBS TB.

FIG. 31B shows an example of unicast retransmission of an MBS TB, according to some embodiments. A wireless device, when subscribed to an MBS session, may receive an initial transmission of an MBS TB (or a TB). The wireless device may receive the initial transmission based on receiving a DCI with CRC scrambled by an MBS-RNTI associated with the MBS session. The wireless device may receive the DCI when the wireless device is monitoring PDCCH on a search space (associated with a CORESET) configured for the MBS session. The wireless device may attempt to decode the MBS TB based on the MBS-RNTI. The wireless device may decode the TB unsuccessfully. The wireless device may buffer the received data for the TB based on the unsuccessfully decoding the TB.

As shown in FIG. 31B, the wireless device may transmit a HARQ NACK indicating that the wireless device decoded the TB unsuccessfully. The base station may, based on the received HARQ NACK, transmit a second DCI with CRC scrambled by the C-RNTI. The second DCI may indicate a retransmission of the MBS TB in a unicast transmission. The second DCI is transmitted dedicatedly to the wireless device (not to second wireless devices other than the wireless device). The retransmission of the MBS TB scheduled by the second DCI is transmitted dedicatedly to the wireless device. The wireless device may receive the retransmitted MBS TB based on receiving the second DCI. The wireless device may combine the first received data (e.g., the initially received TB data based on the 1^(st) DCI) and the second received data (e.g., the newly received TB data based on the 2^(nd) DCI) for the MBS TB. The wireless device may attempt to decode the combined first and second data for the MBS TB.

In an example, the wireless device may decode the combined data successfully. The wireless device may deliver decoded MAC PDU comprised in the MBS TB to a disassembly and demultiplexing entity of the wireless device.

In an example, the wireless device may decode the combined data unsuccessfully. The wireless device, based on unsuccessfully decoding the combined data, may determine to request retransmission based on example of above embodiments.

Retransmission of an MBS TB in a unicast transmission may improve multicast transmission throughput since the base station transmits new MBS TB (or does not perform retransmission of an old MBS TB) in each multicast transmission occasion. Retransmission of a MBS TB in a unicast transmission may increase signaling overhead, e.g., when multiple wireless devices, subscribed to an MBS session, request retransmission of the MBS TB and the base station may retransmit the MBS TB to each of the multiple wireless devices separately.

In an example, a wireless device may receive a multicast initial transmission of an MBS TB and a multicast retransmission of the MBS TB. The wireless device may receive a multicast initial transmission of an MBS TB and a unicast retransmission of the MBS TB. The wireless device, by using existing technologies, may be required to support two types of retransmissions, e.g., a multicast retransmission type and a unicast retransmission type. The wireless device, by supporting both retransmission types, may be required to monitor a first PDCCH on an MBS dedicated search space for receiving a first DCI for the multicast retransmission and monitor a second PDCCH on a unicast search space for receiving a second DCI for the unicast retransmission. Monitoring both PDCCHs for a retransmission of an MBS may increase power consumption of a wireless device and/or increase implementation complexity of the wireless device. There is a need to efficiently handle reception of retransmissions of an MBS TB to reduce power consumption of a wireless device.

In existing technologies, a base station may transmit a unicast DCI indicating a retransmission of an MBS TB (initially scheduled by a multicast DCI), e.g., when the base station receives a HARQ feedback indicating a failure of reception of the MBS TB. The base station may transmit a unicast DCI indicating the retransmission of the MBS TB, based on: the unicast DCI and the multicast DCI comprising a same HARQ process ID, and interlocking a first NDI of the multicast DCI and a second NDI of the unicast DCI (e.g., by not toggling the second NDI comparing with the first NDI). In existing technologies, the unicast DCI and the multicast DCI may be received, by a wireless device, in a same search space, or in a same control resource set of a cell. comparing the two DCIs (e.g., comparing two NDIs and/or two HARQ process IDs) received in the same search space or in the same control resource set may not be a problem for a wireless device in a cell with narrow bandwidth. Similarly, combining two data (one received with a multicast transmission and another one received with a unicast transmission) received in a same frequency range of a cell may not be a problem for a wireless device in a cell with narrow bandwidth.

In a NR system, when a cell with large bandwidth is divided into multiple BWPs (e.g., as shown in FIG. 9 ) and frequency resources for MBS transmissions are separately configured, within a unicast BWP, from frequency resources for unicast transmissions (e.g., as shown in FIG. 28B), a wireless device, by implementing existing technologies, may not be able to decode a MBS TB based on a soft combination of first data (being scrambled by a MBS RNTI) and second data (being scrambled by a C-RNTI). The wireless device, based on existing technologies, may mistakenly determine whether a unicast DCI received in a unicast search space of a BWP is for a unicast TB or for a retransmission of an MBS TB which was previously scheduled by an MBS DCI received in an MBS search space. The MBS search space may be configured with common frequency resources, associated with the MBS, within a unicast BWP. The unicast search space may be configured, (e.g., outside of the common frequency resource), and within the unicast BWP. Existing technologies may reduce system throughput of a cell (or a BWP) supporting both unicast transmissions and MBS transmissions. There is a need to efficiently handle reception of retransmissions of an MBS TB to reduce power consumption of a wireless device when the MBS TB is initially scheduled by an MBS DCI in a common search space and the MBS TB is retransmitted based on unicast DCI in a unicast search space.

In an example embodiment, a base station may transmit to a wireless device one or more configuration parameters of an MBS session. The configuration parameters may comprise an MBS dedicated RNTI (e.g., MBS-RNTI, G-RNTI, SC-RNTI, etc.) associated with the MBS session. The configuration parameters may comprise a retransmission type parameter indicating whether a unicast retransmission or a multicast retransmission will be used by the base station for an MBS TB. The wireless device may receive a multicast initial transmission of an MBS TB and may not successfully decode the MBS TB. The wireless device may transmit, to the base station, a HARQ NACK indicating that the wireless device does not successfully decode the MBS TB.

In an example embodiment, based on the retransmission type indicating that the unicast retransmission is used for an MBS TB, the wireless device may monitor a PDCCH (e.g., via a unicast search space) for receiving a DCI (with CRC scrambled by C-RNTI) scheduling a unicast retransmission of the MBS TB. The wireless device may combine a unicast retransmission of the MBS TB (scrambled by C-RNTI) and a multicast initial transmission of the MBS TB (scrambled by MBS-RNTI) and decode the combined data for the MBS TB.

In an example embodiment, based on the retransmission type indicating that the multicast retransmission is scheduled for an MBS TB, the wireless device may monitor a PDCCH (e.g., via a common search space associated with the MBS) for receiving a DCI (with CRC scrambled by MBS-RNTI) scheduling a multicast retransmission of the MBS TB. The wireless device may combine a multicast retransmission of the MBS TB (scrambled by MBS-RNTI) and a multicast initial transmission of the MBS TB (scrambled by MBS-RNTI).

In an example embodiment, based on the retransmission type indicating that the multicast retransmission is used for an MBS TB, the wireless device may monitor a PDCCH for receiving a DCI (with CRC scrambled by an MBS-C-RNTI) scheduling a multicast retransmission of the MBS TB. The MBS-C-RNTI may be configured by the base station for scheduling retransmission of an MBS TB in a multicast transmission. The MBS-C-RNTI may be separately or independently configured from the MBS-RNTI for initial transmission of the MBS TB. In an example embodiment, when the wireless device unsuccessfully decodes an MBS TB scheduled by a DCI with CRC scrambled by the MBS-RNTI, the wireless device may monitor PDCCH for receiving a second DCI with CRC scrambled by the MBS-C-RNTI for retransmission of the MBS TB.

In an example embodiment, the retransmission type may be configured per MBS session, per BWP, per cell, per cell group, or any combination thereof.

In an example embodiment, the retransmission type may be configured per MBS session. A base station may transmit the configuration parameters of a plurality of MBS sessions, each MBS session being associated with a retransmission type. The retransmission type may indicate whether a unicast retransmission or a multicast retransmission is used for an MBS TB.

In an example embodiment, the retransmission type may be configured per BWP. A base station may transmit the configuration parameters of a plurality of BWPs of a cell. Each BWP may be associated with one or more MBS session. Each BWP may be configured with a retransmission type for the one or more MBS session, the retransmission type indicating whether a unicast retransmission or a multicast retransmission is used for an MBS TB of the one or more MBS session.

In an example embodiment, the retransmission type may be configured per cell. A base station may transmit the configuration parameters of a plurality of cells (e.g., PCell or SCell). Each cell may be associated with one or more MBS session. Each cell may be configured with a retransmission type for the one or more MBS session, the retransmission type indicating whether a unicast retransmission or a multicast retransmission is used for an MBS TB of the one or more MBS session.

In an example embodiment, the retransmission type may be indicated in a DCI. The DCI may be a DCI (e.g., with CRC scrambled by MBS-RNTI) scheduling an initial transmission of an MBS TB. The wireless device may determine a retransmission type for a retransmission of an MBS TB based on the retransmission type in the DCI.

In an example embodiment, a wireless device may determine a retransmission type based on RRC message and a DCI. The wireless device may determine a retransmission type based on RRC message comprising the retransmission type and the DCI not comprising the retransmission type. The wireless device may determine a retransmission type based on RRC message not comprising the retransmission type and the DCI comprising the retransmission type. The wireless device may determine a retransmission type based on overriding a first retransmission type indicated in RRC message by a second retransmission type indicated in DCI.

FIG. 32 shows an example of retransmission of an MBS TB, according to some embodiments. In an example embodiment, a base station may transmit, and/or a wireless device may receive, one or more RRC messages comprising configuration parameters of an MBS session. The configuration parameters may comprise an MBS dedicated RNTI (e.g., MBS-RNTI, MBS-C-RNTI, G-RNTI, SC-RNTI, etc.) associated with the MBS session. The configuration parameters may comprise a retransmission type (mode, configuration, indication, etc.) parameter indicating whether a unicast retransmission or a multicast retransmission will be used by the base station for an MBS TB retransmission. The one or more RRC message may further indicate configuration parameters of frequency resources for the MBS session (e.g., based on the example embodiments described with respect to FIG. 28A and/or FIG. 28B). The one or more RRC message may further indicate configuration parameters of PDCCH for the MBS (e.g., referred to as MBS PDCCH), where the MBS PDCCH may carry a DCI with CRC scrambled by an MBS specific/dedicated RNTI (e.g., MBS-RNTI, SC-RNTI, G-RNTI, etc.). In this specification, the MBS specific/dedicated RNTI, the MBS-RNTI, the SC-RNTI and the G-RNTI may be exchangeable in terms of its being different from C-RNTI. The configuration parameters may indicate frequency resource allocation and time domain allocation of a search space and/or a CORESET for reception of the MBS PDCCH in a BWP. The search space may be a common search space as a contrast to a UE-specific search space. A common search space and/or a UE-specific search space may be implemented based on example embodiments described above with respect to FIG. 22 . In an example, frequency resource allocation and time domain allocation of a search space and/or a CORESET may be implemented based on the example embodiments described with respect to FIG. 25 and/or FIG. 26 .

In an example embodiment, the one or more RRC messages may further comprise a C-RNTI (CS-RNTI, MCS-C-RNTI, etc.) associated with the wireless device. The one or more RRC message may further indicate configuration parameters of PDCCH for unicast transmission (e.g., referred to as unicast PDCCH), where the unicast PDCCH may carry a DCI with CRC scrambled by a wireless device specific RNTI (e.g., C-RNTI, CS-RNTI, MCS-C-RNTI, etc.). The configuration parameters may indicate frequency resource allocation and time domain allocation of a search space and/or a CORESET for reception of the unicast PDCCH in a BWP. In an example, frequency resource allocation and time domain allocation of a search space and/or a CORESET may be implemented based on the example embodiments described with respect to FIG. 25 and/or FIG. 26 .

In an example embodiment, the wireless device may receive a DCI (not shown in FIG. 32 ) with CRC scrambled by an MBS-RNTI via an MBS PDCCH in the BWP, wherein the DCI indicates downlink assignment of MBS PDSCH resources for initial transmission of an MBS TB. The MBS TB, being scrambled by the MBS-RNTI, is transmitted to a group of wireless devices configured with the MBS-RNTI. As shown in FIG. 32 , the wireless device may receive a multicast initial transmission (1^(st) data) of an MBS TB based on the DCI. The DCI (or the group common DCI) and the MBS PDSCH (or the group common PDSCH) may be received in the common frequency resources associated with the MBS within the BWP. The wireless device may not successfully decode the MBS TB.

In an example embodiment, the DCI may be one of a legacy DCI format (e.g., DCI format 1_0/1_1/1_2) or a new DCI format different from the legacy DCI formats. The DCI may have less DCI payloads than the legacy DCI format 1_0. In an example, the DCI may comprise at least one of: time domain resource assignment indication, VRB-to-PRB mapping indication, MCS indication, NDI, redundancy version, HARQ process number, PUCCH resource indicator, PDSCH-to-HARQ_feedback timing indicator, ChannelAccess-CPext, etc. In an example embodiment, one or more DCI fields (e.g., NDI, redundancy version, PUCCH resource indicator, PDSCH-to-HARQ_feedback timing indicator, and/or ChannelAccess-CPext, etc.) may be absent in the DCI for MBS PDSCH scheduling.

As shown in FIG. 32 , the wireless device may transmit a HARQ NACK signaling indicating that the wireless device did not successfully decode the MBS TB. The wireless device may transmit the HARQ NACK signaling comprised in a UCI via a PUCCH resource.

As shown in FIG. 32 , the wireless device may determine whether the retransmission type parameter indicates a unicast retransmission type or a multicast retransmission type. In response to the retransmission type parameter indicating the unicast retransmission type, the wireless device may monitor the unicast PDCCH, on the search space/CORESE associated with the unicast PDCCH, for receiving a first DCI (with CRC scrambled by the C-RNTI/CS-RNTI) scheduling a unicast retransmission of the MBS TB. Based on the monitoring of the unicast PDCCH, the wireless device may receive the first DCI. The wireless device may receive the unicast retransmitted MBS TB (2^(nd) data in FIG. 32 ). The wireless device may combine the initial transmitted data (1^(st) data in FIG. 32 ) and the retransmitted data (2^(nd) data in FIG. 32 ). Based on the combining, the wireless device may decode the MBS TB. In an example, the wireless device may determine whether a unicast PDCCH schedules a retransmission of the MBS TB or an initial transmission of a unicast TB, based on example embodiments of FIG. 33 , FIG. 34 , FIG. 35 and/or FIG. 36 .

In an example embodiment, the wireless device may determine the retransmission type parameter indicates a multicast retransmission type. In response to the retransmission type parameter indicating the multicast retransmission type, the wireless device may monitor the multicast PDCCH, on the search space/CORESE associated with the multicast PDCCH, for receiving a second DCI (with CRC scrambled by the MBS-RNTI) scheduling a multicast retransmission of the MBS TB. Based on the monitoring of the multicast PDCCH, the wireless device may receive the second DCI. The wireless device may receive the multicast retransmitted MBS TB (2^(nd) data in FIG. 32 ). The wireless device may combine the initial transmitted data (1^(st) data in FIG. 32 ) and the retransmitted data (2^(nd) data in FIG. 32 ). Based on the combining, the wireless device may decode the MBS TB.

Example embodiments as described with respect to FIG. 32 may improve signaling overhead for retransmission of an MBS TB. Example embodiments may improve multicast throughput and/or reduce implementation complexity of a wireless device for receiving a retransmission of an MBS TB.

In an example embodiment, a base station may determine a retransmission type for an MBS TB of a MBS session, based on one or more criterion comprising at least one of: a number of wireless devices subscribed to the MBS session, a frequency resource configuration for the MBS session, QoS requirements for the MBS session, a wireless device capability for processing retransmission of a MBS TB, etc. In an example embodiment, the base station may determine a unicast retransmission type for an MBS TB, e.g., when the base station determines a number of wireless devices subscribed to an MBS session is less than a threshold. The base station may determine a multicast retransmission type for an MBS TB, e.g., when the base station determines a number of wireless devices subscribed to an MBS session is greater than a threshold. In an example embodiment, the base station may determine a unicast retransmission type for an MBS TB, e.g., when the base station determines frequency resources of the MBS session are within a unicast BWP. The base station may determine a multicast retransmission type for an MBS TB, e.g., when the base station determines that an MBS dedicated BWP is configured on a cell and the MBS dedicated BWP is different from a unicast BWP of the cell.

In an example embodiment, a wireless device may transmit to the base station a wireless device capability message comprising a retransmission type indication indicating whether the wireless device supports retransmission(s) of an MBS TB via unicast transmission(s) or retransmission(s) of the MBS TB via multicast transmission(s). The retransmission type indication may be indicated per MBS session, per cell, per cell group, per frequency range, etc. The wireless device capability message may further indicate whether the wireless device supports a unicast retransmission of an MBS TB being scrambled by an MBS-RNTI associated with an MBS session or the wireless device supports the unicast retransmission of the MBS TB being scrambled by a C-RNTI associated with the wireless device. The wireless device may transmit the wireless device capability message in response to receiving from a base station a wireless device capability request message. Based on the received wireless device capability message, the base station may transmit to the wireless device the retransmission type parameter.

In an example embodiment, the retransmission type may be indicated in a DCI. The DCI may be a DCI (e.g., with CRC scrambled by MBS-RNTI) scheduling an initial transmission of an MBS TB.

In an example embodiment, a DCI (e.g., with new DCI format different from a legacy DCI format 1_0/1_1/1_2), comprising the retransmission type field, may indicate whether the MBS TB will be retransmitted in a unicast transmission or in a multicast transmission in case retransmission is requested. The wireless device may determine a retransmission type for a retransmission of an MBS TB based on the retransmission type in the DCI.

In an example embodiment, a DCI (e.g., with a legacy DCI format), with one or more DCI fields (e.g., downlink assignment index, PDSCH-to-HARQ_feedback timing indicator, etc.) being set to predefined values, may indicate whether the MBS TB will be retransmitted in a unicast transmission or in a multicast transmission in case retransmission is requested. The wireless device may determine a retransmission type for a retransmission of an MBS TB based on the one or more values of the one or more DCI fields of the DCI.

In an example embodiment, the base station may determine a RNTI for data scrambling for a retransmission of a MBS TB, based on at least one of: a number of wireless devices subscribed to the MBS session, frequency resource configuration for the MBS session, QoS requirements for the MBS session, a wireless device's capability etc. In an example embodiment, for retransmission of a MBS TB, the base station may scramble the MBS TB with an MBS-RNTI in response to determining the retransmission is a multicast retransmission type. The base station may scramble the MBS TB with an MBS-C-RNTI in response to determining the retransmission is a multicast retransmission type, wherein the MBS-C-RNTI is different from the MBS-RNTI configured for initial transmission. The base station may scramble the MBS TB with a C-RNTI in response to determining the retransmission is a unicast retransmission type. In an example embodiment, the base station may scramble the MBS TB with the MBS-RNTI in response to determining the retransmission is a unicast retransmission type.

In an example embodiment, in response to a unicast retransmission of an MBS TB being scrambled by an MBS-RNTI, a wireless device may combine an initial transmission of the MBS TB scrambled by an MBS-RNTI and a retransmission of the MBS TB scrambled by the MBS-RNTI. The wireless device may decode the combined data for the MBS TB.

Retransmitting of an MBS TB in a unicast transmission and scrambled with an MBS-RNTI may simplify decoding complexity of the wireless device.

In an example embodiment, in response to a unicast retransmission of an MBS TB being scrambled by a C-RNTI, a wireless device may combine an initial transmission of the MBS TB scrambled by an MBS-RNTI and a retransmission of the MBS TB scrambled by the C-RNTI. The wireless device may decode the combined data for the MBS TB. Retransmitting of an MBS TB in a unicast transmission and scrambled with a C-RNTI may improve transmission security of the MBS TB.

In an example embodiment, when a base station determines a unicast retransmission of an MBS TB of an MBS session, the base station may scramble the MBS TB with an MBS-RNTI associated with the MBS session and retransmit the scrambled MBS TB in a unicast PDSCH resource. The base station may scramble a number of bits (e.g., b^((q))(0), . . . , b^((q))(M_(bit) ^((q))−1)) of a codeword of the MBS TB according to {tilde over (b)}^((q))(i)=(b^((q))(i)+c^((q))(i)) mod 2. Scrambling sequence c^((q))(i) may be generated according to the following equation:

c(n)=(x ₁(n+N _(C))+x ₂(n+N _(C)))mod 2

x ₁(n+31)=(x ₁(n+3)+x ₁(n))mod 2

x ₂(n+31)=(x ₂(n+3)+x ₂(n+2)+x ₂(n+1)+x ₂(n))mod 2

-   -   where N_(C)=1600 and the first m-sequence x₁(n) shall be         initialized with x₁(0)=1, (n)=0, n=1, 2, . . . , 30.

In an example embodiment, a scrambling sequence generator for the scrambling sequence may be initialized with c_(init)=n_(RNTI)·2¹⁵+q·2¹⁴+n_(ID), where n_(RNTI) corresponds to the MBS-RNTI associated with an MBS session. n_(ID) may be equal to a data scrambling identity configured for the MBS PDSCH or for the MBS session. n_(ID) (e.g., a new dataScrambingIdentityMBS-PDSCH IE configured in configuration parameters of the MBS configuration) may be differently or separately configured from a higher-layer parameter dataScramblingIdentityPDSCH configured for a unicast PDSCH transmission. Separately configuration n_(ID)s for MBS PDSCH (or group common PDSCH dedicated for the MBS) and unicast PDSCH may increase transmission security for the MBS session.

In an example, a higher-layer parameter dataScramblingIdentityPDSCH may be applied for determination of n_(ID) when a DCI scheduling the unicast PDSCH transmission is CRC scrambled by C-RNTI, MCS-C-RNTI, or CS-RNTI, and the DCI is not a DCI format 1_0 received in a common search space. For unicast PDSCH scheduled by a DCI, n_(ID) may be equal to a cell identifier of the cell if the higher-layer parameter dataScramblingIdentityPDSCH is not configured, or if the RNTI for the DCI does not equal the C-RNTI, MCS-C-RNTI, or CS-RNTI, or if the DCI is a DCI format 1_0 via a common search space.

Based on the example embodiment, a base station may transmit, and/or a wireless device may receive RRC messages comprising first configuration parameters of an MBS session and second configuration parameters for unicast transmissions. The first configuration parameter and/or the second configuration parameters may be implemented based on example embodiments described above with respect to FIG. 28B, FIG. 31A, FIG. 31B, and/or FIG. 32 . In an example embodiment, the first configuration parameters may indicate that common frequency resources, of the MBS session, are configured within a BWP (e.g., based on example embodiments described above with respect to FIG. 28B). The first configuration parameters may indicate a first RNTI (e.g., MBS-RNTI, SC-RNTI, G-RNTI, etc.) associated with the MBS session. The first configuration parameters may indicate a first PDSCH data scrambling identity associated with the MBS session. The first configuration parameters may indicate resource configuration parameters of a group common PDCCH associated with the MBS session.

In an example embodiment, the second configuration parameters may comprise configuration parameters of the BWP. The second configuration parameters may indicate a second RNTI (e.g., C-RNTI, CS-RNTI, MCS-C-RNTI, etc.) associated with the unicast transmissions dedicated to the wireless device. The second configuration parameters may indicate a second PDSCH data scrambling identity associated with the unicast transmissions dedicated to the wireless device. The second configuration parameters may indicate resource configuration parameters of a unicast PDCCH associated with the unicast transmissions. In an example, the second RNTI may be different from the first RNTI. The second PDSCH data scrambling identity may be different from the first PDSCH data scrambling identity.

In an example embodiment, the wireless device may receive, based on the first RNTI and via the common frequency resources, a group common DCI scheduling a transport block of the MBS session. The group common DCI may be received with a first DCI format (e.g., DCI format 1_0/1_1/1_2 as described above, or a new DCI format different from DCI format 1_0/1_1/1_2 as described above). The wireless device may select, the first PDSCH data scrambling identity from the first PDSCH data scrambling identity and the second PDSCH data scrambling identity, based on the group common DCI being received based on the first RNTI. In an example, the wireless device may select the first PDSCH data scrambling identity, regardless of whether the group common DCI is received with DCI format 1_0. The wireless device may receive (decode or detect), via the common frequency resources, the transport block based on the transport block being scrambled with a scrambling sequence, wherein the scrambling sequence is initialized by the selected first PDSCH data scrambling identity and the first RNTI.

In an example embodiment, the wireless device may receive, based on the second RNTI and via the BWP (e.g., outside of the common frequency resources associated with the MBS session), a unicast DCI scheduling a second transport block dedicated to the wireless device. The wireless device may select, the second PDSCH data scrambling identity from the first PDSCH data scrambling identity and the second PDSCH data scrambling identity, based on the unicast DCI being received based on the second RNTI. The wireless device may receive (decode or detect), via the BWP (e.g., outside of the common frequency resources associated with the MBS session), the second transport block based on the second transport block being scrambled with a second scrambling sequence, wherein the second scrambling sequence is initialized by the selected second PDSCH data scrambling identity and the second RNTI. Example embodiment, based on determining a scrambling sequence being initialized by a data scrambling identity associated with an MBS session and a RNTI associated with the MBS session, may increase robustness of multicast transmission of an MBS session to a plurality of wireless devices configured with the MBS session.

In an example embodiment, a scrambling sequence generator for the scrambling sequence may be initialized with c_(init)=n_(RNTI)·2¹⁵+q·2¹⁴+n_(ID), wherein n_(RNTI) corresponds to the MBS-RNTI associated with an MBS session. In an example, n_(ID) may be equal to zero. In an example, n_(ID) may be equal to a cell ID of the cell via which the wireless device receives MBS TBs of the MBS session.

In an example embodiment, when a base station determines a multicast retransmission of an MBS TB of an MBS session, the base station may scramble the MBS TB with MBS-C-RNTI associated with the MBS session, wherein the MBS-C-RNTI may be configured dedicatedly for retransmission of the MBS TB in a multicast transmission. In an example embodiment, when a base station determines a multicast retransmission of an MBS TB of an MBS session, the base station may scramble the MBS TB with MBS-RNTI associated with the MBS session, wherein the MBS-RNTI may be configured same for initial transmission and retransmission of the MBS TB.

FIG. 33 shows an example of HARQ process management for an MBS session, according to some embodiments (e.g., based on extension of example embodiments described above with respect to FIG. 32 ). A wireless device may receive from a base station one or more RRC messages comprising configuration parameters of a cell. The configuration parameters may indicate a plurality of HARQ processes (HARQ process x, HARQ process y, HARQ process m, HARQ process n, etc.) associated with the cell. The configuration parameters may indicate the plurality of HARQ processes are grouped into HARQ process groups, each HARQ process group comprising one or more HARQ processes of the plurality of HARQ processes. A first HARQ process group (e.g., comprising HARQ process m, HARQ process n, etc.) may be associated with unicast PDSCH transmissions. One or more second HARQ process group (e.g., comprising HARQ process x, HARQ process y, etc.) may be associated with MBS transmissions.

In an example embodiment, each MBS session of a plurality of MBS sessions may be associated with a respective HARQ process group of the one or more second HARQ process groups.

In an example, multiple MBS sessions of the plurality of MBS sessions may be associated with a shared HARQ process group of the one or more second HARQ process groups.

In an example embodiment, separating HARQ processes for unicast transmissions and MBS transmissions may enable the base station or the wireless device to flexibly manage HARQ processes. Separating HARQ processes for unicast transmissions and MBS transmissions may enable the wireless device to correctly decode a retransmitted MBS TB when the retransmitted MBS TB is scheduled by a unicast DCI and transmitted in a unicast PDSCH resource.

FIG. 32 and FIG. 33 may be combined. In an example embodiment, based on the HARQ process grouping (e.g., as shown in FIG. 33 ), the wireless device may determine whether a retransmission of an MBS TB is via a multicast transmission or via a unicast transmission (e.g., as shown in FIG. 32 ).

FIG. 34 shows an example of retransmission of an MBS TB in a unicast PDSCH resource, according to some embodiments (e.g., based on extension of example embodiments described above with respect to FIG. 32 and/or FIG. 33 ). In an example embodiment, a wireless device may receive, from a base station, one or more RRC messages comprising configuration parameters of an MBS session. The one or more RRC messages may be implemented based on the example embodiments described with respect to FIG. 32 .

In an example embodiment, the wireless device may receive a first DCI (1^(st) DCI in FIG. 34 ) with CRC scrambled by an MBS-RNTI via an MBS PDCCH in the BWP. The first DCI may be received in a first SS associated with the MBS session. The first DCI may be received in a first control resource set associated with the MBS session. The first DCI may be received within the common frequency resources associated with the MBS session. The first DCI may indicate downlink assignment of MBS PDSCH resources for initial transmission of an MBS TB (1^(st) TB in FIG. 34 ). The MBS TB, being scrambled by the MBS-RNTI, is transmitted to a group of wireless devices configured with the MBS-RNTI. The first DCI may comprise a HARQ process ID (PID=k in FIG. 34 ) indicating a HARQ process associated with the MBS TB. The first DCI may comprise a first new data indicator (NDI) value.

As shown in FIG. 34 , the wireless device may receive a multicast initial transmission of the MBS TB via a first PDSCH resource indicated by the first DCI. The wireless device may not successfully decode the MBS TB. Based on not successfully decoding the MBS TB, the wireless device may buffer the received data for the MBS TB in a HARQ buffer associated with a HARQ process (identified by the HARQ process ID).

In an example embodiment, the first DCI may be one of legacy DCI formats (e.g., DCI format 1_0/1_1/1_2), or a new DCI format different from the legacy DCI formats. The first DCI may have less DCI payloads than the legacy DCI format 1_0. In an example, the first DCI may comprise at least one of: time domain resource assignment indication, VRB-to-PRB mapping indication, MCS indication, NDI, redundancy version, HARQ process number, PUCCH resource indicator, PDSCH-to-HARQ_feedback timing indicator, ChannelAccess-CPext, etc. In an example embodiment, one or more DCI fields (e.g., NDI, redundancy version, PUCCH resource indicator, PDSCH-to-HARQ_feedback timing indicator, and/or ChannelAccess-CPext, etc.) may be absent in the first DCI for MBS PDSCH scheduling.

As shown in FIG. 34 , the wireless device may transmit a HARQ NACK signaling indicating that the wireless device did not successfully decode the MBS TB. Based on the received HARQ NACK signaling, the base station may determine a unicast retransmission of the MBS TB. The base station may determine a unicast retransmission of the MBS TB based on the example embodiments described with respect to FIG. 32 . The base station may transmit a second DCI (2^(nd) DCI in FIG. 34 ) with CRC scrambled by C-RNTI via a unicast PDCCH in the BWP. The second DCI may be received in a second search space which is a wireless device specific search space different from the first search space, wherein the first search space is a common search space. The second DCI may be received in the BWP (e.g., outside of the common frequency resources associated with the MBS session). The second DCI may be received in a second control resource set which is different from the first control resource set associated with the MBS session. The second DCI may indicate downlink assignment of unicast PDSCH resources for retransmission of the MBS TB. The retransmission of the MBS TB, being scrambled by the MBS-RNTI or by the C-RNTI, is transmitted to the wireless device dedicatedly. The second DCI may comprise a HARQ process ID (PID=k in FIG. 34 ) indicating a same HARQ process as the initial transmission of the MBS TB.

As shown in FIG. 34 , the wireless device receives the second DCI. The wireless device may receive data via a second PDSCH resource indicated by the second DCI. In response to the HARQ ID of the second DCI being same as the HARQ ID of the first DCI and the second DCI being CRC scrambled by C-RNTI and the first DCI being CRC scrambled by MBS-RNTI, the wireless device may determine the received data in the second PDSCH resource is a retransmission of the MBS TB initially transmitted in the first PDSCH resource. Based on the HARQ ID of the second DCI being same as the HARQ ID of the first DCI, the first DCI being received in a search space different from the second DCI and the first DCI being received in the common frequency resources where the second DCI is received outside of the common frequency resources, the wireless device may determine the received data in the second PDSCH resource is a retransmission of the MBS TB initially transmitted in the first PDSCH resource.

In an example embodiment, the wireless device may determine that an NDI, associated with a HARQ process identified by the HARQ ID, is not toggled (e.g., by comparing a second NDI of the second DCI and a first NDI of the first DCI). The wireless device may determine an NDI may be toggled or not toggled based on example embodiments described above with respect to FIG. 29 .

In an example, the wireless device may determine the NDI is not toggled regardless of an NDI value of the second DCI in response to the HARQ ID of the second DCI being the same as the HARQ ID of the first DCI and the second DCI being CRC scrambled by C-RNTI and the first DCI being CRC scrambled by MBS-RNTI. The wireless device may ignore the NDI value of the second DCI in response to the HARQ ID of the second DCI being the same as the HARQ ID of the first DCI and the second DCI being CRC scrambled by C-RNTI and the first DCI being CRC scrambled by MBS-RNTI.

In an example, the wireless device, based on the NDI not being toggled and/or the HARQ ID of the second DCI being the same as the HARQ ID of the first DCI, may determine the received data in the second PDSCH resource is a retransmission of the MBS TB initially transmitted in the first PDSCH resource. Based on the NDI not being toggled and/or the HARQ ID of the second DCI being the same as the HARQ ID of the first DCI, the wireless device may combine the buffered data and the data received in the second PDSCH resource for the MBS TB. The wireless device may decode the combined data.

Based on the example shown in FIG. 32 , FIG. 33 and/or FIG. 34 , a wireless device may determine a combination of a multicast initial transmission of MBS TB with a unicast retransmission of the MBS TB, e.g., based on at least one of: a second NDI, of a unicast DCI received in a UE-specific search space and outside of the common frequency resources of the BWP, being same as (or not being toggled compared with) a first NDI of a group common DCI received in a common search space and in common frequency resources within a BWP, a second HARQ process index, of the unicast DCI, being same as a first HARQ process index of the group common DCI. Example embodiment may improve system throughput when HARQ is supported for an MBS session.

Example embodiments of FIG. 32 , FIG. 33 and/or FIG. 34 may be combined. In an example, a base station may configure (e.g., based on indication of wireless device capability or without indication of the wireless device capability) a retransmission type (or mode) for an MBS TB based on example embodiments described above with respect to FIG. 32 . The base station, based on the retransmission type, may group a plurality of HARQ processes into first HARQ processes associated with the MBS session and second HARQ processes associate with unicast transmissions, e.g., based on example embodiments described above with respect to FIG. 33 . Based on the configured retransmission type and/or grouping the plurality of HARQ processes, the wireless device may determine reception of a retransmission of an MBS TB based on example embodiments described above with respect to FIG. 34 . Example embodiments may improve power consumption of a wireless device, and/or system throughput of a base station for MBS transmission.

FIG. 35 shows an example of retransmission of a TB when both a unicast retransmission of a unicast TB and a unicast retransmission of an MBS TB are supported, according to some embodiments.

As shown in FIG. 35 , a wireless device may receive a first DCI (1^(st) DCI) indicating a downlink assignment of a first PDSCH resource for a first TB associated with a HARQ process (PID=k). The wireless device may receive the first data for the TB via the first PDSCH resource indicated by the first DCI. The wireless device may store the HARQ information for the HARQ process based on the example embodiments described with respect to FIG. 29 and/or FIG. 30 .

The wireless device may receive a second DCI (2^(nd) DCI) indicating a downlink assignment of a second PDSCH resource of a second TB associated with the same HARQ process (PID=k) as the first DCI. The wireless device may receive the second data for the second TB via the second PDSCH resource indicated by the second DCI. The second DCI may be with CRC scrambled by C-RNTI. The second DCI may comprise an NDI value.

As shown in FIG. 35 , the wireless device may determine a RNTI value for the first DCI based on decoding the first DCI.

In response to the RNTI value of the first DCI being MBS-RNTI, the RNTI value of the second DCI being C-RNTI and the HARQ process ID of the second DCI being same as the first DCI, the wireless device may determine the unicast transmission scheduled by the second DCI is a retransmission of a multicast transmission of a MBS TB, based on example embodiments described above with respect to FIG. 34 . In an example, based on the RNTI value of the first DCI being MBS-RNTI, the RNTI value of the second DCI being C-RNTI and the HARQ process ID of the second DCI being same as the first DCI, the wireless device may determine an NDI associated with the HARQ Process k not being toggled (e.g., regardless of the NDI value of the second DCI). Based on the NDI not being toggled and/or the HARQ process ID of the second DCI being same as the first DCI, the wireless device may determine the second TB is the same as the first TB and the second data received in the second PDSCH resource is a retransmission of the first TB initially received in the first PDSCH resource. Based on the NDI not being toggled and/or the HARQ process ID of the second DCI being same as the first DCI, the wireless device may combine the first data and the second data for the TB. The wireless device may decode the combined data.

In response to the RNTI value of the first DCI being CS-RNTI (e.g., for semi-persistent scheduling via periodic PDSCH resources for a semi-persistent scheduling configuration), the RNTI value of the second DCI being C-RNTI and the HARQ process ID of the second DCI being the same as the first DCI, the wireless device may determine an NDI associated with the HARQ Process k being toggled regardless of the NDI value of the second DCI. Based on the NDI being toggled, the wireless device may determine the second TB is different from the first TB and the second data received in the second PDSCH resource is an initial transmission of the second TB. Based on the NDI being toggled, the wireless device may decode the second TB based on the second data (and not based on the first data).

Based on the example embodiment described with respect to FIG. 35 , the wireless device may manage HARQ retransmission for SPS and MBS. Example embodiment may improve system throughput when HARQ is supported for an MBS session.

FIG. 36 shows an example of retransmission of a TB when both unicast retransmissions of a unicast TB and an MBS TB are supported, according to some embodiments.

As shown in FIG. 36 , a wireless device may receive from a base station one or more RRC messages comprising configuration parameters of a cell. The configuration parameters may indicate a plurality of HARQ processes (HARQ process x, HARQ process y, . . . , HARQ process m, HARQ process n, etc.) associated with the cell. The configuration parameters may indicate the plurality of HARQ processes are grouped into HARQ process groups, each HARQ process group comprising one or more HARQ processes of the plurality of HARQ processes. A first HARQ process group (e.g., comprising HARQ process m, HARQ process n, etc.) may be associated with unicast PDSCH transmissions. One or more second HARQ process group (e.g., comprising HARQ process x, HARQ process y, etc.) may be associated with MBS transmissions. The grouping of the plurality of HARQ processes may be implemented based on the example embodiments described with respect to FIG. 33 .

As shown in FIG. 36 , the wireless device may receive a DCI indicating a downlink assignment of a first PDSCH resource for a first TB associated with a HARQ process (PID=k). The DCI, with CRC being scrambled by C-RNTI, may comprise a HARQ process ID indicating the HARQ process, an NDI value.

The wireless device may receive data for the TB via the first PDSCH resource indicated by the DCI. The wireless device may store the HARQ information for the HARQ process and/or store the received data in a HARQ buffer of the HARQ process based on the example embodiments with respect to FIG. 29 and/or FIG. 30 .

In an example embodiment, the wireless device may deactivate an active BWP based on the example embodiments described with respect to FIG. 22 . The wireless device may flush HARQ buffers for the MBS in response to deactivating the active BWP. The wireless device may flush HARQ buffers for the MBS when the MBS dedicated BWP is deactivated.

As shown in FIG. 36 , the wireless device may determine whether the HARQ process belongs to the first HARQ process group or belongs to the or more second HARQ process group.

In response to the HARQ process belonging to the first HARQ process group, the wireless device may determine the first TB is an initial transmission or a retransmission of a unicast TB. The wireless device may determine the first TB is an initial transmission or a retransmission of a unicast TB based on an NDI value of the DCI, e.g., by implementing the example embodiments described with respect to FIG. 30 . In response to the HARQ process belonging to the first HARQ process group, the wireless device may determine whether the NDI is toggled based on the NDI value of the DCI and a stored NDI value for a same HARQ process. In response to the NDI being toggled, the wireless device may determine the data received in the first PDSCH resource is a new (or initial) transmission of the first TB. The wireless device may decode the received data for the first TB. In response to the NDI not being toggled, the wireless device may determine the data received in the first PDSCH resource is a retransmission of the first TB received previously. The wireless device may combine the data received in the first PDSCH resource and the data stored in the HARQ buffer previously. The wireless device may decode the combined data for the first TB.

In response to the HARQ process belonging to the one or more second HARQ process group, the wireless device may determine the first TB is a unicast retransmission of an MBS TB. In response to the HARQ process belonging to the one or more second HARQ process group, the wireless device may determine the NDI is not toggled regardless of the NDI value of the DCI. Based on the NDI not being toggled, the wireless device may combine the received data in the first PDSCH and a buffered data for the MBS TB. The wireless device may decode the combined data for the MBS TB.

Example embodiments of FIG. 32 , FIG. 33 , FIG. 34 , FIG. 35 and/or FIG. 36 may be combined as an embodiment. In an example, a base station may configure (e.g., based on indication of wireless device capability or without indication of the wireless device capability) a retransmission type (or mode) for an MBS TB based on example embodiments described above with respect to FIG. 32 . The base station, based on the retransmission type, may group a plurality of HARQ processes into first HARQ processes associated with the MBS session and second HARQ processes associate with unicast transmissions, e.g., based on example embodiments described above with respect to FIG. 33 . Based on the configured retransmission type and/or grouping the plurality of HARQ processes, the wireless device may determine reception of a retransmission of an MBS TB based on example embodiments described above with respect to FIG. 34 and/or FIG. 36 .

In an example, a wireless device may receive a group common DCI indicating a multicast transmission of first data of a TB, based on example embodiments described above with respect to FIG. 34 . The group common DCI may indicate a first HARQ process index. The first HARQ process index may belong to first HARQ process indexes group of a plurality of HARQ process indexes groups, based on example embodiments described above with respect to FIG. 33 . The first HARQ process indexes group may be dedicatedly associated with the MBS transmissions. The wireless device may determine the first data of the TB is associated with the multicast transmissions of an MBS session (which may be referred to as a multicast TB in this specification) based on the first HARQ process index belonging to the first HARQ process indexes group. The wireless device may determine the first data of the TB is associated with the multicast transmissions of an MBS session based on the first HARQ process index not belonging to a HARQ process indexes group associated with unicast transmissions.

In an example, the wireless device may transmit a negative HARQ feedback in response to a failure of decoding the multicast TB based on the first data, based on example embodiments described above with respect to FIG. 34 .

In an example, the wireless device may receive a unicast DCI scheduling a unicast transmission of second data, based on example embodiments described above with respect to FIG. 34 . The unicast DCI may comprise a second HARQ process index and a second NDI value. The wireless device may determine whether the unicast DCI schedules a unicast TB or schedules a retransmission of the multicast TB based on whether the second HARQ process index belongs to the first HARQ process indexes group or the second HARQ process indexes group, e.g., based on example embodiments described above with respect to FIG. 36 .

In an example, in response to the second HARQ process index, of the unicast DCI, belonging to the second HARQ process indexes group associated with the unicast transmissions, the wireless device may determine the second data is for a unicast TB. The wireless device may decode the unicast TB based on the second data. The wireless device may not combine the second data and the first data for decoding the unicast TB or for decoding the multicast TB.

In an example, in response to the second HARQ process index, of the unicast DCI, belonging to the first HARQ process indexes group associated with the MBS transmission, the wireless device may determine whether the second data is for a retransmission of the multicast TB based on at least one of: whether the second HARQ process index of the unicast DCI is same as the first HARQ process of the multicast DCI, whether a second NDI of the unicast DCI is same as a first NDI of the multicast DCI, e.g., based on example embodiments described above with respect to FIG. 34 . In an example, the wireless device may determine the second data is for a retransmission of the multicast TB based on at least one of: the second HARQ process index of the unicast DCI being same as the first HARQ process of the multicast DCI, the second NDI of the unicast DCI being same as a first NDI of the multicast DCI. In an example, the wireless device may determine the second data is for an initial transmission of a second multicast TB based on at least one of: the second HARQ process index of the unicast DCI being different from the first HARQ process of the multicast DCI, the second NDI of the unicast DCI being different from a first NDI of the multicast DCI. The second HARQ process index may belong to the first HARQ process indexes group associated with the MBS transmissions. The second HARQ process index may not belong to the second HARQ process indexes group associated with the unicast transmissions. Example embodiments may improve power consumption of a wireless device, and/or system throughput of a base station for MBS transmission.

In an example embodiment, a wireless device may receive, from a base station and based on an MBS identifier, a first DCI indicating a transmission of an MBS TB of an MBS session. The wireless device, based on the first DCI, may receive a first data of the MBS TB associated with a HARQ process. The wireless device may transmit negative feedback for the MBS TB. The wireless device may receive a second data based on a second DCI with a second identifier, the second DCI comprising an NDI value and a HARQ process identifier. The wireless device may determine an NDI of the HARQ process not being toggled regardless of the NDI value of the second DCI in response to the HARQ process identifier indicating the HARQ process and CRC bits of the second DCI being scrambled by the second identifier. The wireless device may decode, based on the NDI not being toggled, the MBS TB based on a combination of the first data and the second data.

In an example embodiment, the wireless device may receive, from the base station, configuration parameters of a bandwidth part of a cell, wherein the configuration parameters indicate the MBS identifier with the MBS session and the second identifier associated with the wireless device.

In an example embodiment, the wireless device may transmit negative feedback for the MBS TB and via an uplink control channel resource in response to decoding the MBS TB unsuccessful.

In an example embodiment, the second identifier may be a C-RNTI associated with the wireless device. The MBS identifier may be an MBS-RNTI associated with the MBS session.

In an example embodiment, the wireless device may receive the first DCI in a first search space configured for the MBS session on a BWP of a cell. The wireless device may receive the second DCI in a second search space configured for the wireless device to receive unicast PDCCH on a BWP of a cell.

In an example embodiment, the wireless device may monitor a PDCCH via the second search space based on the second identifier. The wireless device may store the first data in a HARQ buffer associated with the HARQ process.

In an example embodiment, the first data of the MBS TB may be scrambled by the MBS identifier. The second data of the MBS TB may be scrambled by the MBS identifier or the second identifier.

In an example embodiment, the MBS TB may be transmitted to a group of wireless devices configured with the MBS session. The group of wireless devices may be configured with the MBS identifier based on the group of wireless devices being subscribed to the MBS session.

In an example embodiment, the wireless device may be configured with the MBS identifier based on the wireless device being subscribed to the MBS session. The wireless device may transmit, to the base station, an MBS interest information indicating that the wireless device is interested in the MBS session. The wireless device may receive an MBS command indicating the base station starts the MBS session. The wireless device may monitor a PDCCH for the first DCI based on the MBS starting command.

In an example embodiment, the wireless device may skip transmitting a positive acknowledgement for the MBS TB in response to successfully decoding the MBS TB based on the combination of the first data and the second data. The wireless device may transmit a positive acknowledgement for the MBS TB in response to successfully decoding the MBS TB based on the combination of the first data and the second data. In an example embodiment, the wireless device may transmit a negative acknowledgement for the MBS TB in response to unsuccessfully decoding the MBS TB based on the combination of the first data and the second data.

In an example, the wireless device may receive, from the base station, a retransmission type indication indicating that the MBS TB is retransmitted in a PDSCH resource dedicated to the wireless device and/or the retransmission of the MBS TB is scheduled by a unicast DCI addressed to the wireless device. The retransmission type indication is comprised in at least one of: one or more radio resource control message and/or the first DCI.

In an example, a wireless device may receive, from a base station, configuration parameters indicating a plurality of HARQ processes being grouped into a first HARQ process group for unicast transmissions and a second HARQ process group for MBS transmissions. The wireless device may receive, based on a C-RNTI, a DCI indicating a transmission of first data of a TB associated with a HARQ process. The wireless device may receive the first data for the TB associated with the HARQ process. The wireless device may combine the first data and a buffered data for the TB in response to determining the HARQ process belonging to the second HARQ process group. The wireless device may decode the TB based on the combining the first data and the buffered data.

In an example, the DCI may comprise an NDI value and a HARQ process identifier identifying the HARQ process. The wireless device may determine an NDI of the HARQ process not being toggled regardless of the NDI value of the DCI based on determining the HARQ process belonging to the second HARQ process group and there being stored data in a HARQ buffer associated with the HARQ process. The wireless device may determine an NDI of the HARQ process not being toggled regardless of the NDI value of the DCI based on determining a second data of the TB is decoded unsuccessfully, wherein the second data is scheduled by a second DCI with MBS-RNTI, the second DCI indicating the HARQ process. The wireless device may store the second data in a HARQ buffer of the HARQ process. The buffered data may be the stored second data. 

1. A method comprising: receiving, by a wireless device, parameters comprising: a radio network temporary identifier (RNTI) associated with a multicast and broadcast service (MBS) session; a first scrambling identity associated with the MBS session; and a second scrambling identity associated with unicast transmissions; receiving, based on the RNTI, a group common downlink control information (DCI) scheduling a transport block (TB) of the MBS session; based on the group common DCI being received based on the RNTI, determining a scrambling identity for the TB being equal to the first scrambling identity; and receiving the TB being scrambled with a scrambling sequence initialized by: the determined scrambling identity; and the RNTI.
 2. The method of claim 1, wherein: the group common DCI is addressed to a plurality of wireless devices comprising the wireless device; and the TB, scheduled by the group common DCI, is addressed to the plurality of wireless devices.
 3. The method of claim 1, comprising receiving the group common DCI based on cyclic redundancy check (CRC) bits, of the group common DCI, being scrambled by the RNTI.
 4. The method of claim 1, further comprising receiving a unicast DCI scheduling a second TB based on CRC bits, of the unicast DCI, being scrambled by a second RNTI, wherein the second RNTI is different from the RNTI.
 5. The method of claim 4, further comprising: based on the unicast DCI being received based on the second RNTI, determining a scrambling identity for the second TB being equal to the second scrambling identity; and receiving the second TB being scrambled with a second scrambling sequence initialized by: the second scrambling identity; and the second RNTI.
 6. The method of claim 1, wherein the parameters indicate common frequency resources, associated with the MBS session, within a bandwidth part (BWP) of a cell.
 7. The method of claim 6, comprising receiving the group common DCI and the TB in the common frequency resources within the BWP.
 8. The method of claim 6, wherein the parameters indicate: a starting resource block (RB) of RBs of the common frequency resources; and a number of the RBs.
 9. The method of claim 8, wherein an RB of the RBs comprises one or more resource elements in the frequency domain.
 10. The method of claim 8, wherein the RBs of the common frequency resources are a subset of RBs of the BWP.
 11. A wireless device comprising: one or more processors; and memory storing instructions that, when executed by the one or more processors, cause the wireless device: receive parameters comprising: a radio network temporary identifier (RNTI) associated with a multicast and broadcast service (MBS) session; a first scrambling identity associated with the MBS session; and a second scrambling identity associated with unicast transmissions; receive, based on the RNTI, a group common downlink control information (DCI) scheduling a transport block (TB) of the MBS session; based on the group common DCI being received based on the RNTI, determine a scrambling identity for the TB being equal to the first scrambling identity; and receive the TB being scrambled with a scrambling sequence initialized by: the determined scrambling identity; and the RNTI.
 12. The wireless device of claim 11, wherein: the group common DCI is addressed to a plurality of wireless devices comprising the wireless device; and the TB, scheduled by the group common DCI, is addressed to the plurality of wireless devices.
 13. The wireless device of claim 11, wherein the instructions, when executed by the one or more processors, further cause the wireless device to receive the group common DCI based on cyclic redundancy check (CRC) bits, of the group common DCI, being scrambled by the RNTI.
 14. The wireless device of claim 11, wherein the instructions, when executed by the one or more processors, further cause the wireless device to receive a unicast DCI scheduling a second TB based on CRC bits, of the unicast DCI, being scrambled by a second RNTI, wherein the second RNTI is different from the RNTI.
 15. The wireless device of claim 14, wherein the instructions, when executed by the one or more processors, further cause the wireless device to: based on the unicast DCI being received based on the second RNTI, determine a scrambling identity for the second TB being equal to the second scrambling identity; and receive the second TB being scrambled with a second scrambling sequence initialized by: the second scrambling identity; and the second RNTI.
 16. The wireless device of claim 11, wherein the parameters indicate common frequency resources, associated with the MBS session, within a bandwidth part (BWP) of a cell.
 17. The wireless device of claim 16, wherein the instructions, when executed by the one or more processors, further cause the wireless device to receive the group common DCI and the TB in the common frequency resources within the BWP.
 18. The wireless device of claim 16, wherein the parameters indicate: a starting resource block (RB) of RBs of the common frequency resources; and a number of the RBs.
 19. The wireless device of claim 18, wherein an RB of the RBs comprises one or more resource elements in the frequency domain.
 20. The wireless device of claim 18, wherein the RBs of the common frequency resources are a subset of RBs of the BWP. 